Delta DTC Series Digital Controller Instruction Sheet
Thank you for purchasing the DELTA DTC Series Temperature Controller. Please read this instruction sheet before using your DTC series to ensure proper operation, and keep this instruction sheet handy for quick reference.
! Caution
DANGER! Caution! Electric Shock!
The DTC series is an OPEN-TYPE device and therefore should be installed in an enclosure free of airborne dust, humidity, electric shock, and vibration. The enclosure should prevent non-maintenance staff from operating the device (e.g., key or specific tools are required to open the enclosure) in case danger and damage to the device may occur.
! WARNING!
- Prevent dust or metallic debris from falling into the controller that will cause malfunction. DO NOT modify or disassemble the controller. DO NOT use extra terminals.
- Do not install and/or use the controller in places subject to: (a) dust or corrosive gases and liquid; (b) high humidity and high radiation; (c) vibration and shock.
- Switch off the power when wiring or changing input sensors.
- Be sure to use compensating wires that match the thermocouple types when extending or connecting the thermocouple wires.
- Shorten the wire when wiring a platinum resistance thermometer (RTD) to the controller, and separate the power cable from load wires to prevent interference and conductive influence.
- Make sure the power cable and signals device are installed correctly before switching on the power of DTC; otherwise, serious damage may occur.
- DO NOT touch the terminals or repair the controller when the power is on to prevent electric shock.
- Wait at least one minute after the power is off to allow the capacitor to discharge. DO NOT touch any internal circuit within this period.
- DO NOT touch the internal terminals no matter the power is on or off.
- DO NOT place other heating source (e.g., power supply) in parallel with DTC during the installation. Please keep proper space in between.
Model Name Explanation
| Series name | DTC: Delta C series temperature controller | |
| 1 Controller position | 1: First controller | 2: Controller connected in parallel |
| 2 Auxiliary output groups | 0: standard, 2 outputs, no auxiliary output 1: 1 auxiliary output. Not available now. |
2: 2 auxiliary outputs. Not available now |
| 3 4 Optional | 00: Standard 01: CT input |
02: EVENT input. Not available now |
| 5 Main output type | R: Relay output SPST, 250VAC, 3A V: Voltage pulse output 12V +10% ~ -20% |
C: Current output 4 ~ 20mA L: Linear voltage output 0~10V |
(DTC1000/2000 model): DC24V input, 2 outputs, relay output for output 2, RS-485 communication.
(DTC1001/2001 model): DC24V input, 1 output, 1 CT input, and RS-485 communication.
Function & Specification
- Power supply
- DC24V. Isolated switching power
- Voltage range
- Rated voltage: 90% ~ 110%
- Power consumption
- Rated 24 VDC, Max. 24 W combined, 3W + 3W x number of DTC2000 controllers (Max. 7)
- Input sensors
- Thermocouple: K, J, T, E, N, R, S, B, L, U, TXK
Platinum RTD: Pt100, JPt100
Linear DC input: 0~5V, 0~10V, 0~20mA, 4~20mA, 0 ~ 50mV - Sampling rate
- Analog input: 0.15 sec. Thermocouple or platinum RTD: 0.4 sec.
- Control method
- PID, programmable PID, Manual, ON/OFF
- Output types
- Relay: SPST, Max. load 250VAC, 3A resistive load
Voltage pulse: 12VDC, Max. output current: 40mA
Current: DC 4~20mA (Load resistance: < 500Ω)
Analog voltage: 0~10V (Load resistance: > 1,000Ω) - Output function
- Control output, alarm output, proportional output
Proportional output is available only when output 1 is linear voltage/current output. - Alarm
- 13 alarm modes
- Communication
- RS-485 digital communication, 2,400bps ~ 38,400bps
- Communication protocol
- Modbus protocol, ASCII/RTU format
- Internal connection
- Internal terminals available to transmit 24V power supply and communication signals
- Vibration resistance
- 10 ~ 55Hz, 10m/s² for 10mins, each in X, Y and Z direction
- Shock resistance
- Max. 300m/s², 3 times in each 3 axes, 6 directions
- Ambient temperature
- 0 ~ 50°C
- Storage temperature
- -20 ~ +65°C
- Altitude
- < 2,000m
- Ambient humidity
- 35% ~ 85% RH (non-condensing)
- Pollution degree
- 2
Product Profile & Outline
DTC1000/1001 R/V/C/L
- 1 RUN/STOP switch
- 2 Wiring and Model name
- 3 DIN rail clip
- 4 I/O terminals
- 5 LED indicators
- 6 Mounting hole
- 7 Specification label
- 8 Extension port
- 9 Extension clip
- 10 DIN rail
- 11 RS-485 communication port
- 12 Extension clip
- 13 DC power input
DTC2000/2001 R/V/C/L
- 1 Wiring and Model name
- 2 DIN rail clip
- 3 I/O terminals
- 4 LED indicators
- 5 Mounting hole
- 6 Specification label
- 7 Extension port
- 8 Extension clip
- 9 DIN rail
- 10 Extension port
Input
DTC series supports the following input sensors:
| Input Sensor | Register Value | Available Range |
| 0~50mV linear voltage input | 17 | 0~50mV |
| 4~20mA linear current input | 16 | 4~20mA |
| 0~20mA linear current input | 15 | 0~20mA |
| 0~10V linear voltage input | 14 | 0~10V |
| 0~5V linear voltage input | 13 | 0~5V |
| Platinum RTD (Pt100) | 12 | -200 ~ 600°C (-328 ~ 1,112°F) |
| Platinum RTD (JPt100) | 11 | -20 ~ 400°C (-4 ~ 752°F) |
| Thermocouple TXK type | 10 | -200 ~ 800°C (-328 ~ 1,472°F) |
| Thermocouple U type | 9 | -200 ~ 500 °C (-328 ~ 932°F) |
| Thermocouple L type | 8 | -200 ~ 850°C (-328 ~ 1562°F) |
| Thermocouple B type | 7 | 100 ~ 1,800°C (212 ~ 3,272°F) |
| Thermocouple S type | 6 | 0~1,700°C (32 ~ 3,092°F) |
| Thermocouple R type | 5 | 0~1,700°C (32 ~ 3,092°F) |
| Thermocouple N type | 4 | -200 ~ 1,300°C (-328 ~ 2,372°F) |
| Thermocouple E type | 3 | 0~600°C (32~1,112°F) |
| Thermocouple T type | 2 | -200 ~ 400°C (-328 ~ 752°F) |
| Thermocouple J type | 1 | -100 ~ 1,200°C (-148 ~ 2,192°F) |
| Thermocouple K type | 0 | -200 ~ 1,300°C (-328 ~ 2,372°F) |
Note 1: The current input is built-in with 2490 precision resistor. See "How To Set up Current Input" section.
Note 2: Default setting: Pt100 input.
The range of linear input and feedback value is adjustable. Range of input feedback: -999~9,999. Take 0 ~ 20mA input as example, -999 refers to 0mA input, and 9,999 refers to 20mA input. If we change the range to 0 ~ 2,000, 0 will refer to 0mA input, and 2,000 will refer to 20mA input. 1 display scale = 0.01mA.
Output
There are several output types available from DTC series: Control Output (heating/cooling), Alarm Output and Proportional Output.
Control Output
DTC series offers 2 outputs for heating or cooling control. If you require dual loop output, the 2 outputs should be set to different actions (heating or cooling). If you require the 2 outputs are set to the same control action, only the control cycle of output 1 will be valid, and the 2 outputs will act at the same time.
The control methods include: PID control, ON/OFF control, Manual control and programmable PID control.
Single Output Control:
Figure 1: ON/OFF Control
Figure 2: PID Control, Cooling) Control
Figure 3: PID Control, Heating Control
Dual Output Control:
Figure 4: ON/OFF Control
Figure 5: PID control
Figure 6: PID Control
Programmable PID Control & Parameters Setting
The programmable PID control includes 8 patterns (Pattern 0 ~ 7). Each pattern contains 8 steps (Step 0~7) and parameters: "link pattern", "cycle" and "the number of steps".
Start Pattern:
The user can set up which pattern is the start pattern for the programmable control.
Steps:
Includes the settings of the two parameters, set point X and execution time T, indicating that the set point (SV) has to rise to temperature X after the period of execution time T. If the result of the set point X is the same as that of the previous setting, the process is called "Soak"; otherwise, it is called "Ramp". Therefore, the programmable control is also known as Ramp/Soak control. The default setting of the first step is Soak control. The temperature will first rise to the set point X and remain at X. The total execution time is T.
Link Pattern:
The pattern to be executed following the current pattern. If the setting is not 0 ~ 7, the set point will remain at the last pattern.
Cycle:
The additional number of cycles for a pattern. For example, if the parameter is set to 2, it refers to the pattern has to execute additional twice, totaling the execution to 3 times including the original one.
The Number of Steps:
The number of steps in each pattern (range: 0~7). For example, if the parameter is set to 2, it refers to the pattern will execute Step 0 ~ Step 2, and other steps will not be executed.
The Execution:
Available settings include "run", "program hold", "program stop" or "stop".
- When this parameter is set to "run", the program will start its execution from step 0 of the start pattern.
- When this parameter is set to "program hold", the program will stop and the temperature will stop at the SV before the program stops. If the user sets to "run" again, the program will resume the step before the program stops and execute by the remaining time.
- When this parameter is set to "program stop", the program will stop and the temperature will stop at the SV before the program stops. If the user sets to "run" again, the program will execute again from Step 0 of the start pattern.
- When this parameter is set to "stop", the program will stop, and the control output will be disabled.
Proportional Output:
If Output 1 of this DTC series is linear voltage or current, the user can set it to "Proportional Output". Proportional output refers to the output varies with the input. For example, if the input range is set to 0 ~ 1,000, and when the input value is 0, the output will be 0mA or 0V. When the input value is 1,000, the output will be 20mA or 10V.
Figure 7: Proportional Output
Alarm Output
DTC series offers 13 alarm modes. When the PV exceeds or falls below SV, the alarm output will be enabled. See the table below for the 13 modes.
| Mode | Alarm Type | Alarm Output Operation |
| 0 | No alarm | OFF |
| 1 | Alarm output will be enabled when the temperature reaches upper and lower limits. • Alarm will be enabled when the PV exceeds SV + AL-H or falls below SV – AL-L. |
ON OFF AL-L SV AL-H |
| 2 | Alarm output will be enabled when the temperature reaches the upper limit. • Alarm will be enabled when the PV exceeds SV + AL-H. |
ON OFF SV AL-H |
| 3 | Alarm output will be enabled when the temperature reaches the lower limit. • Alarm will be enabled when the PV falls below SV - AL-L. |
ON OFF AL-L SV |
| 4 | • Alarm will be enabled when the PV is between SV + AL-L and SV - AL-L. | ON OFF AL-L SV AL-H |
| 5 | Alarm output will be enabled when the temperature reaches the absolute value of the upper and lower limits. • Alarm will be enabled when the PV exceeds AL-H or falls below AL-L. |
ON OFF AL-L AL-H |
| 6 | Alarm output will be enabled when the temperature reaches the absolute value of the upper limit. • Alarm will be enabled when the PV exceeds AL-H. |
ON OFF AL-H |
| 7 | Alarm output will be enabled when the temperature reaches the absolute value of the lower limit. • Alarm will be enabled when the PV falls below AL-L. |
ON OFF AL-L |
| 8 | Standby upper/lower limit alarm • Alarm will be enabled when the PV reaches SV and exceeds SV + AL-H or falls below SV - AL-L. |
ON OFF AL-L SV AL-H |
| 9 | Upper limit standby alarm • Alarm will be enabled when the PV reaches SV and exceeds SV + AL-H. |
ON OFF SV AL-H |
| 10 | Lower limit standby alarm • Alarm will be enabled when the PV reaches SV and falls below SV - AL-L |
ON OFF AL-L SV |
| 11 | Upper limit hysteresis alarm • Alarm will be enabled when the PV exceeds SV + AL-H and disabled when the PV falls below SV + AL-L. |
ON OFF AL-L AL-H |
| 12 | Lower limit hysteresis alarm • Alarm will be enabled when the PV falls below SV – AL-H and disabled when the PV exceeds SV - AL-L. |
ON OFF AL-H AL-L |
| 13 | CT alarm output: • This alarm operates when the current measured by transformer (CT) is lower than AL-L or higher than AL-H |
ON OFF AL-L AL-H |
Note: AL-H and AL-L include AL1H, AL2H, AL1L and AL2L. When Output 1 is set to Alarm Output, use AL1H (1024H) and AL1L (1025H). When Output 2 is set to Alarm Output, use AL2H (1026H) and AL2L (1027H).
CT Function
- When CT is adopted, the communication address 106AH of the alarm output should be set to 02H only.
- When CT is adopted, the alarm mode should be set to 13 and the communication address 1021H to 0DH only.
- The user can adjust the upper limit and lower limit of CT Alarm. If the current detected by CT exceeds the upper/lower limit, ALM 2 will be set to "1".
1039H: Status of CT Alarm
1026H: Upper limit of CT Alarm (unit: 0.1A) Max. setting: 40.0A; Default setting: 100 (10.0A)
1027H: Lower limit of CT Alarm (unit: 0.1A) Min. setting: 0; Default setting: 5 (0.5A)
102BH: Current detected by CT (unit: 0.1A)
CT only measures current when there is control output; otherwise only the previous CT value will be displayed.
LED Display
- When power is normal, POWER LED will be on.
- After DTC is switched on, all LED will be on. The communication protocol will be displayed in 1 second, followed by the communication address in the next second.
- RUN LED is on when the control is executing.
- ERROR LED is on when errors occur in input, memory or communication.
- When an output is executing, its corresponding output LED will be on.
- AT LED flashes when PID parameters are being auto-tuned.
- RX LED flashes when DTC receives communication signals. TX LED flashes when DTC sends out communication signals.
Communication protocol displayed on LED after the power of DTC is switched on:
| AT | TX | RX | Err | Run |
| 000: 2,400bps 011: 19,200bps |
001: 4,800bps 100: 38,400bps |
010: 9,600bps Parity 00: None 10: Odd 01: Even |
0: ASCII 1: RTU |
0: 2 Stop bits 1: 1 Stop bit |
Communication address display: AT (bit 6) and Run (bit 0) are combined to binary code.
Password Function
The default setting of the password is disabled. To enable the password function, enter the 4-character password in the specific communication address. The password is protected by 3 levels.
- Level 1: Only LED status, SV and PV can be read. No settings can be modified.
- Level 2: Only LED status, SV and PV can be read. Only SV can be modified.
- Level 3: All SV can be read. Only SV and auto-tuning can be modified.
- Level 4: No password protection.
When a password is set (in 106EH ~ 1070H), the protection will enter Level 1. To enter other levels, enter the corresponding password (in 106BH ~ 106DH). After DTC is switched off, the protection will return to Level 1. To unlock the password protection, the user has to remove all the passwords (in 106EH ~ 1070H).
The password protection level can be read in 106EH ~ 1070H:
| bit | Status | bit | Status | bit | Status | bit | Status | bit | Status | bit | Status |
| b0 | Level 1 | b1 | Level 2 | b2 | Level 3 | b3 | Level 1 locked | b4 | Level 2 locked | b5 | Level 3 locked |
bit = 0 refers to no password is set. bit = 1 refers to the password has been set (b0 ~ b2). b3 ~ b6 display the current level status.
Synchronous Communication Protocol & Auto ID Setup
This function allows the user to set the communication protocol of DTC2000/2001 to the same protocol as set in the first DTC1000/1001. The station IDs of DTC are arranged in decreasing order. Follow the steps below.
- Set the auto communication ID of DTC1000/1001 to "1" (communication address: 1022H).
- Switch off DTC1000/1001 before connecting it to DTC2000/2001. Switch it on again.
- Default communication protocol: 9,600bps, 7 bits, Even, 1 stop bit, communication address 01.
- This function will consume 3 ~ 5 seconds more when you switch on your DTC.
RS-485 Communication
- Supports transmission speed: 2,400, 4,800, 9,600, 19,200, 38,400bps;
- Does not support 7, N, 1/8, E, 2 / 8, O, 2 communication format;
- Communication protocol: Modbus ASCII/RTU;
- Function code: 03H (read Max. 8 words in register), 06H (write 1 word into register), 01H (read Max. 16 bits of data), 05H (write 1 bit into register).
| Address | Setting | Content | Explanation |
| 1000H | Present temperature value (PV) | Unit: 0.1 degree. Analog input: 1EU. The read values below indicate the occurrence of errors: 8002H: Temperature not acquired yet 8003H: Temperature sensor not connected 8004H: Incorrect sensor type 8006H: Unable to acquire temperature, ADC input error 8007H: Unable to read/write the memory |
|
| 1001H | Set point (SV) | Unit: 0.1 degree. Analog input: 1EU. | |
| 1002H | Upper-limit of temperature range | The content shall not be bigger than the range. Unit: 0.1° | |
| 1003H | Lower-limit of temperature range | The content shall not be smaller than the range. Unit: 0.1° | |
| 1004H | Input sensor type | See the table in "Input" section. | |
| 1005H | Control method | 0: PID, 1: ON/OFF, 2: Manual, 3: programmable PID | |
| 1006H | Control method for Output 1 | 0: Heating (default); 1: Cooling; 2: Alarm; 3: Proportional (required analog output) | |
| 1007H | Control cycle of Output 1 | 0~99, 0: 0.5sec | |
| 1008H | Control cycle of Output 2 | 0~99, 0: 0.5sec (Invalid when the 2 outputs are the same control.) (DTC1000/2000 model) | |
| 1009H | Proportional band value | 1~9,999, Unit: 0.1°. Analog input: 1EU | |
| 100AH | Ti value | 0~9,999 | |
| 100BH | Td value | 0~9,999 | |
| 100CH | Default integration value | 0~1,000, Unit: 0.1% | |
| 100DH | Offset compensation value for proportional control (when Ti=0)) | 0~1,000, Unit: 0.1% | |
| 100EH | COEF setting when in dual control output | 1~9,999, Unit: 0.01 (1000/2000 model) | |
| 100FH | Deadband setting when in dual control output | -999~9,999, Unit: 0.1° or 1EU (1000/2000 model) | |
| 1010H | Hysteresis of Output 1 | 0~9,999, Unit: 0.1° or 1EU | |
| 1011H | Hysteresis of Output 2 | 0~9,999, Unit: 0.1° or 1EU (1000/2000 model) | |
| 1012H | Read/write output percentage of Output 1 | Unit: 0.1%. "Write" is only applicable in manual mode. | |
| 1013H | Read/write output percentage of Output 2 | Unit: 0.1%. "Write" is only applicable in manual mode. (1000/2000 model) | |
| 1014H | Upper-limit regulation for analog linear output | 1 scale = 2.8μΑ = 1.3mV | |
| 1015H | Lower-limit regulation for analog linear output | 1 scale = 2.8μΑ = 1.3mV | |
| 1016H | Temperature offset regulation value | -999~ +999, Unit: 0.1° or 1EU | |
| 1020H | Output mode for Alarm 1 | See "Alarm Output" section. | |
| 1021H | Output mode for Alarm 2 | See "Alarm Output" section. | |
| 1022H | Communication flag auto-set | 0: Communication banned, 1: Communication auto-set | |
| 1023H | Control method for Output 2 | 0: Heating (default); 1: Cooling; 2: Alarm (DTC1000/2000 model) | |
| 1024H | Upper limit for Alarm 1 | See "Alarm Output" section. | |
| 1025H | Lower limit for Alarm 1 | See "Alarm Output" section. | |
| 1026H | Upper limit for Alarm 2 | See "Alarm Output" section. (DTC1000/2000 model) | |
| 1027H | Lower limit for Alarm 2 | See "Alarm Output" section. (DTC1000/2000 model) | |
| 1028H | Upper limit for CT Alarm | CT Alarm lower limit ~ 400, 1 scale = 0.1A (DTC1001/2001 model) | |
| 1029H | Lower limit for CT Alarm | 0~ CT Alarm upper limit, 1 scale = 0.1A (DTC1001/2001 model) | |
| 102AH | Read/write status | b1: ALM2, b2: °C, b3: °F, b4: ALM1, b5: 02, b6:01, b7: AT | |
| 102BH | Read current detected by CT | Unit = 0.1A (DTC1001/2001 model) | |
| 102CH | Positive/negative proportional output | 0: positive, 1: negative | |
| 102EH | LED status | b0: RUN, b1: ERR, b2: O2, b3: 01, b4: RX, b5:TX b6: AT | |
| 102FH | Software version | V1.00 is indicated as 0x100 | |
| 1030H | No. of start pattern | 0~7 | |
| 1032H | Remaining time of the executed step | Unit: second | |
| 1033H | Remaining time of the executed step | Unit: minute | |
| 1034H | No. of currently executed step | 0~7 | |
| 1035H | No. of currently executed pattern | 0~7 | |
| 1036H | Read dynamic value in programmable control | 0~100% upper limit of analog output, Unit: 0.1% | |
| 1037H | Upper limit of proportional output | 0~100% upper limit of analog output, Unit: 0.1% | |
| 1038H | Lower limit of proportional output | 0~100% lower limit of analog output, Unit: 0.1% | |
| 1039H | CT Alarm status | 0: Disabled, 1: Enabled (DTC1001/2001 model) | |
| 1040H~1047H | Number of steps in a pattern | 0~7 = N refers to the pattern will be executed from Step 0 to Step N. | |
| 1050H~1057H | Additional number of cycles for a pattern | 0~199 refers to the pattern will be executed for 1 ~ 200 times. | |
| 1060H~1067H | No. of the link pattern for the current pattern | 0~8, 8 refers to end of the program. 0~ 7 refers to the next pattern No. following the current pattern. | |
| 1068H | Run/Stop setting | 0: Stop, 1: Run, 2: Program end, 3: Program hold | |
| 1069H | Control selection of Output 1 | 0: Heating, 1: Cooling, 2: Alarm, 3: Proportional output | |
| 106AH | Control selection of Output 2 | 0: Heating, 1: Cooling, 2: Alarm (1000/2000 model) | |
| 106BH | Unlock Level 1 password protection. Read/write allowed | Shall be the same as Level 1 password (106E) | |
| 106CH | Unlock Level 2 password protection. Use Level 3. | Shall be the same as Level 2 password (106F) | |
| 106DH | Unlock Level 3 password protection. Use Level 2 | Shall be the same as Level 3 password (1070) | |
| 106EH | Unlock Level 1 password protection/Set up password | Unlock password before setting it up. | |
| 106FH | Unlock Level 2 password protection/Set up password | Unlock password before setting it up. | |
| 1070H | Unlock Level 3 password protection/Set up password | Unlock password before setting it up. | |
| 1071H | Read/write communication address | 1~247 | |
| 1072H | Read/write communication format | 1: RTU, 0: ASCII | |
| 1073H | Read/write communication speed | 0~4: 2,400 ~ 38,400 | |
| 1074H | Read/write communication data length | 0: 8 bits, 1: 7 bits | |
| 1075H | Read/write parity bit | 0: None, 1: Even, 2: Odd | |
| 1076H | Read/write stop bit | 0: 2 stop bits, 1: 1 stop bit | |
| 2000H~203FH | SV temperature for Pattern 0~7. SV for Pattern 0 is set in 2000H ~ 2007H | Unit: 0.1° | |
| 2080H~20BFH | Execution time for Pattern 0~7. Time for Pattern 0 is set in 2080H ~ 2087H | 0~900 (1 scale = 1 minute) |
5. Address and content of the bit register (read bits are stored starting from LSB, and written data is FF00H, set the bit as 1. 0000H sets the bits data to "0").
| Unit | Content | Explanation |
| 0811H | Temperature unit display | 0:°F, 1: °C (Default) |
| 0813H | Read/write auto-tuning status | 0: End (Default), 1: Start |
| 0814H | Run/Stop setting | 0: Stop, 1: Run (Default) |
| 0815H | Program hold flag | 1: Program hold |
| 0816H | Program stop flag | 1: Program stop |
6. Communication format: Command 01: read bit, 05: write bit, 03: read word, 06: write word.
ASCII Mode
| Read Command | Read Response Message | Write Command | Write Response Message | ||||
| Start word | ':' | Start word | ':' | Start word | ':' | Start word | ':' |
| Machine address 1 | '0' '0' | Machine address 1 | '0' '0' | Machine address 1 | '0' '0' | Machine address 1 | '0' '0' |
| Machine address 0 | '1' '1' | Machine address 0 | '1' '1' | Machine address 0 | '1' '1' | Machine address 0 | '1' '1' |
| Command 1 | '0' '0' | Command 1 | '0' '0' | Command 1 | '0' '0' | Command 1 | '0' '0' |
| Command 0 | '3' '1' | Command 0 | '3' '1' | Command 0 | '6' '5' | Command 0 | '6' '5' |
| Read Command | Read Response Message | Write Command | Write Response Message | ||||
| Read staring address | '0' '8' | Length of response data (byte) | '0' '0' '4' '2' | Write data address | '0' '8' '0' '8' | Write data address | '0' '8' '0' '8' |
| Read length of data/bit (word/bit) | '0' '0' '0' '1' | Data content in 1000H/081xH | 'F' '0' 'F' '0' | To write data content | '3' 'F' '3' 'F' | Write data content | 'E' '0' 'E' '0' |
| LRC1 check | 'E' 'D' | Data content in 1001H | '0' '8' '0' '8' | LRC1 | 'F' 'E' | LRC1 | 'F' 'E' |
| LRCO check | 'A' 'D' | LRCO check | '0' 'D' '3' | LRCO | 'D' '3' | LRCO | 'D' '3' |
| End word 1 | CR CR | LRC1 check | '0' 'E' | End word 1 | CR CR | End word 1 | CR CR |
| End word 0 | LF LF | End word 0 | LF LF | End word 0 | LF LF | End word 0 | LF LF |
LRC Check
LRC check sums up from "machine address" to "data content", e.g. 01H + 03H + 10H+ 00H + 00H + 02H = 16H. Obtain 2's complement EA.
RTU Mode
| Read Command | Read Response Message | Write Command | Write Response Message |
| Machine address 01H 01H | Machine address 01H 01H | Machine address 01H 01H | Machine address 01H 01H |
| Command 03H 01H | Command 03H 01H | Command 06H 05H | Command 06H 05H |
| Read start address 10H 08H | Length of response data (byte) 04H 02H | Write data address 10H 08H | Write data address 00H 10H |
| Read length of data (bit/word) 00H 00H | Data content 1 01H 17H | Write data content 03H FFH | Write data content 20H 00H |
| CRC low byte COH BBH | CRC high byte CBH A9H | CRC low byte DDH 8FH | CRC high byte E2H 9FH |
CRC Program Example
unsigned int reg_crc = 0xffff; i = 0;
while (length--)
{
i ++;
reg_crc ^= RTUData[i];
for (j = 0; j < 8; j++)
if (reg_crc & 0x01) reg_crc = (reg_crc >> 1) ^ 0xA001;
else reg_crc = reg_crc >> 1;
}
return(reg_crc);
Installation
How to connect maximum 8 DTC1000/2000 controllers by using DIN rail.
How to Set Up Current Input
For general input
For current input (4~20mA, 0~20mA)
