MYRONL RS485AD1 Multi-Parameter Monitor Controller
Specifications:
- Isolated Half duplex
- Connector Type: RJ12
- Connector Label: RS-485
- All data values are comma-separated
- Data is represented in ASCII characters
- Serial Baud Rate: 115200
- Parity Bit: No
- Time Interval (in seconds): 30
Product Usage Instructions
Connection Steps:
- Connect the RJ12 to RJ12 straight pinned line cord to the RS-485 adaptor.
- Connect the RS-485 adaptor to the data-logging device (e.g., computer) using an RS-485 to USB Industrial Converter.
- Connect the pins as per the provided connection examples, ensuring proper signal and ground connections.
- If using terminations, short TERM 1 to TERM 2 on the last unit and apply terminations to both ends of the cable.
Enabling/Disabling Line Termination:
To enable/disable line termination on the RS-485 adapter, adjust the Line Termination Jumper to either ON (Enabled) or OFF (Disabled) position as needed.
FAQ
- Q: Do I need to make programming modifications for streaming data on the 900 Series model 900M-3C?
- A: No, streaming is automatic on the 900 Series model 900M-3C; programming modifications are not necessary.
- Q: Are terminations required for cable lengths?
- A: Termination is usually not required for cable lengths, but if used, ensure terminations are applied to both ends of the cable.
Instructions for Streaming Serial Output Using the RS-485 Communication Port
The RS-485 communication port on the 900 Series allows data logging of the date/time, location, and measurement information in the form of serial ASCII data. It is one-way data streaming from the 900 Series to a data logging device such as a computer.
Programming modifications are not necessary on the 900 Series model 900M-3C; streaming is automatic.
Specifications
- RS-485 Serial Output
- Isolated
- Half duplex
- Connector Type: RJ12
- Connector Label: RS-485
- All data values are comma-separated
- Data is represented in ASCII characters
- Serial Baud Rate: 115200
- Parity Bit: No
- Time Interval (in seconds): 30
Connection
Connection Examples
Example #1 using customer-supplied equipment:
To enable cable line termination on the last unit, short TERM 1 to TERM 2.
NOTE: If you use terminations, they must be applied to both ends of the cable
Example #2 using a Myron L® Company RS-485 Adapter (Part # RS485AD1):
Enable/Disable Line Termination on the RS-485 Adapter:
- Terminating Resistor: 120 Ω
- Termination is usually not required for cable lengths <100’.
- If you use terminations, they must be applied to both ends of the cable (the RS485AD1 and the user-supplied
- RS-485 to USB converter).
- Follow industry guidelines for your application to determine if line termination is required.
- Use only RS-485 twisted pair wire (example: Belden 3105A).
- Connect the three wires of the RS-485 to port A or port B as shown above.
- For a chart of RS-485 Streaming Serial Output Data, of this document.
RS-485 Streaming Serial Output Data in Order of Transmittal (data is comma delimited):
| Data Label | Example of Data | Data Description | Data Detail |
| Date and Time | 10/29/21 14:15:15 | Date and Time value from the 900 | |
| Location Name | TC DESK | Location Name stored in the 900 | |
| COND/RES 1 Value | 990.719 | Primary Measurement Value, Sensor: Cond/Res1 | If no sensor, then reported reading will be -3000.00 (equivalent to N/A) 1 |
| COND/RES 1 Unit | ppm | Primary Measurement Unit, Sensor: Cond/Res1 | |
| COND/RES 1 Temp. Value | 23.174 | Secondary Measurement Value (Temperature), Sensor: Cond/Res1 | If no sensor, then reported reading will be -1.000 (equivalent to N/A) 1 |
| COND/RES 1 Temp. Unit | C | Secondary Measurement Unit (Temperature), Sensor: Cond/Res1 | |
| COND/RES 2 Value | 164.008 | Primary Measurement Value, Sensor: Cond/Res2 | If no sensor, then reported reading will be -3000.00 (equivalent to N/A) 1 |
| COND/RES 2 Unit | ppm | Primary Measurement Unit, Sensor: Cond/Res2 | |
| COND/RES 2 Temp. Value | 3.827 | Secondary Measurement Value (Temperature), Sensor: Cond/Res2 | If no sensor, then reported reading will be -1.000 (equivalent to N/A) 1 |
| COND/RES 2 Temp. Unit | C | Secondary Measurement Unit (Temperature), Sensor: Cond/Res2 | |
| MLC pH/ORP Value | 6.934 | Primary Measurement Value, Sensor: MLC pH/ORP | If no sensor, then reported reading will be -3000.00 (equivalent to N/A) 1 |
| MLC pH/ORP Unit | Primary Measurement Unit, Sensor: MLC pH/ORP | pH unit: Blank ORP unit: mV | |
| MLC pH/ORP Temp. Value | 4.199 | Secondary Measurement Value (Temperature), Sensor: MLC pH/ORP | If no sensor, then reported reading will be -1.000 (equivalent to N/A) 1 |
| MLC pH/ORP Temp. Unit | C | Secondary Measurement Unit (Temperature), Sensor: MLC pH/ORP | |
| mV IN Value | 6.993 | Primary Measurement Value, Sensor: mV IN | If no sensor, then reported reading will be -3000.00 (equivalent to N/A)1, 2 |
| mV IN Unit | Primary Measurement Unit, Sensor: mV IN | pH unit: Blank ORP unit: mV | |
| mV IN Temp. Value | 96.197 | Secondary Measurement Value (Temperature), Sensor: mV IN | If no sensor, then reported reading will be -1.000 (equivalent to N/A) 1, 2 |
| mV IN Temp. Unit | C | Secondary Measurement Unit (Temperature), Sensor: mV IN | |
| RTD Temp. Value | 96.195 | Primary Measurement Value, Sensor: RTD | If no sensor, then reported reading will be -3000.00 (equivalent to N/A) |
| RTD Temp. Unit | C | Primary Measurement Unit, Sensor: RTD | |
| N/A | -1.000 | Not Used | Not Used |
| N/A | C | Not Used | Not Used |
| 4-20 mA IN Value | 0.004 | Primary Measurement Value, Sensor: 4-20mA In | |
| 4-20 mA IN Unit | mA | Primary Measurement Unit, Sensor: 4-20mA In | |
| N/A | -1.000 | Not Used | Not Used |
| N/A | Not Used | Not Used | |
| Flow/Pulse Value | 0.000 | Primary Measurement Value, Sensor: Flo/Pulse | |
| Flow/Pulse Unit | gpm | Primary Measurement Unit, Sensor: Flo/Pulse | |
| Flow/Pulse Secondary Value | 0.000 | Secondary Measurement Value, Sensor: Flo/Pulse | Value of Flow or Volume -1.000 if primary measurement is Pulse |
| Flow/Pulse Secondary Unit | Gal | Secondary Measurement Unit, Sensor: Flo/Pulse | Unit of Flow or Volume Blank if primary measurement is Pulse |
| % Rejection Value | 83.446 | Primary Measurement Value, Sensor: % Rejection | N/A if % Rejection is disabled on the 900 |
| % Rejection Unit | % | Primary Measurement Unit, Sensor: % Rejection | N/A if % Rejection is disabled on the 900 |
| N/A | -1.000 | Not Used | N/A |
| N/A | C | Not Used | N/A |
1A reading of “-3000” for a primary measurement or “-1.000” for a secondary measurement is an indication that there is no sensor detected, or there is an error in settings.
2 If the mV IN input channel’s measurement type is set to pH (with temperature compensation), the secondary measurement (temperature) will be the same as the RTD input channel. If there is no temperature sensor connected to the RTD input, both the primary and secondary mV IN measurements will indicate no sensor detected
Built On Trust. Founded in 1957, the Myron L Company is one of the world’s leading manufacturers of water-quality instruments. Because of our commitment to product improvement, changes in design and specifications are possible. You have our assurance any changes will be guided by our product philosophy: accuracy, reliability, and simplicity.
- 2450 Impala Drive Carlsbad, CA 92010-7226 USA
- Tel: +1-760-438-2021
- Fax: +1-800-869-7668/+1-760-931-9189
- www.myronl.com
Documents / Resources
 | MYRONL RS485AD1 Multi Parameter Monitor Controller [pdf] Instruction Manual RS485AD1 Multi Parameter Monitor Controller, RS485AD1, Multi Parameter Monitor Controller, Parameter Monitor Controller, Monitor Controller, Controller |
