1. Introduction
The SHANGSIMOUDLECX HXDSBOXAI series is a versatile digital display meter designed to work with various sensors that provide analog output. It can display actual physical quantities such as temperature, frequency, motor speed, pressure, liquid level, and concentration.
This instrument supports both current and voltage input signals. It is pre-configured to adapt to standard inputs like 0-10V, 2-10V, 0-20mA, and 4-20mA. Users can also configure bias and gain parameters to adapt to other analog inputs within the 0-10V or 0-20mA range.
By default, the display shows values as a percentage. The display range can be customized using parameters F0-2 to F0-4. Models equipped with an RS485 interface facilitate communication between multiple meters for networked display solutions.
2. Main Features
- Model Variants:
- Standard Version: HXDSBOXAI-NR
- With RS485 Version: HXDSBOXAI-485
- With Relay Output Version: HXDSBOXAI-RL
- Power Supply:
- Standard and RS485 Versions: DC 6-25V (Power consumption: 24V/40mA)
- Relay Output Version: DC 8-25V (Power consumption: 24V/50mA)
- Features anti-reverse connection and surge protection.
- Analog Input: One analog input, selectable as voltage type or current type.
- Input Impedance: >30kΩ for voltage input, <250Ω for current input.
- User Interface: Rich parameter settings accessible via integrated buttons. Features a 0.56-inch 4-digit digital tube display.
- Communication (RS485 Version): Supports standard Modbus-RTU protocol for easy networking and multi-display setups.
- Relay Output (Relay Output Version): Includes 1 normally open relay output with a load capacity of 3A30VDC/3A250VAC.
- Physical Dimensions: Mechanical size: 79×43×25mm; Installation opening: 76.5×39.5mm.
3. Specifications
3.1. General Specifications
- Display: 0.56 inch, 4-digit digital tube
- Input Signal Types: 0-10V, 2-10V, 0-20mA, 4-20mA (configurable)
- Operating Temperature: Not specified, typically industrial standard.
- Storage Temperature: Not specified.
3.2. Port Signal Description
| Signal | Explanation |
|---|---|
| PWR | Connect to the positive pole of the power supply (Standard/RS485: DC6~30V; Relay Output: DC8~30V) |
| GND | Power and signal ground |
| Ai | Analog input signal (voltage type) |
| mA | Current-type analog input signal configuration interface. Short-circuit with Ai for current-type input. |
| 485- | RS485 signal negative (for 'with RS485 version' only) |
| 485+ | RS485 signal positive (for 'with RS485 version' only) |
| KA | Relay normally open contact output port (for 'with relay output version' only) |
| KB | Relay normally open contact output port (for 'with relay output version' only) |
4. Setup and Wiring
4.1. Physical Installation
The meter has mechanical dimensions of 79×43×25mm and requires an installation opening of 76.5×39.5mm. Ensure proper ventilation and avoid locations with excessive heat, moisture, or vibration.
4.2. Wiring Diagrams
Refer to the following diagrams for common wiring configurations:
This image illustrates three wiring configurations: Voltage input (PWR, GND, Ai, mA, KA, KB terminals, with 0-10V input and 24V power for KA/KB), Current input (PWR, GND, Ai, mA, 485+, 485- terminals, with 4-20mA input and Modbus connection), and a Two-wire current sensor wiring example (PWR, GND, Ai, NC, NC terminals, with 4-20mA sensor and 24V power). Ensure correct polarity and terminal connections.
4.3. Back Panel Overview
This image shows the back of the HXDSBOXAI-NR model, featuring the model name and a detailed wiring diagram for power (6-25V), ground, analog input (0-10V or 0/4-20mA), and optional RS485 connections. The terminals are labeled PWR, GND, Ai, mA, NC, NC, 485+, 485-.
5. Operation and Menu Navigation
5.1. Front Panel Controls
The front panel features a digital display and four control buttons: SET, Up arrow, Down arrow, and OK. Indicator lights R, T, and S are also visible. R and T indicate RS485 communication (Receive and Transmit), while S indicates relay closure (for relay output versions).
5.2. Indicator Lights
- R (Receive): Only for 'with RS485 version'. Indicates communication data reception.
- T (Transmit): Only for 'with RS485 version'. Indicates communication data transmission.
- S (Status): Only for 'with relay output version'. Illuminates when the relay is closed.
5.3. Menu Navigation and Parameter Adjustment
This diagram illustrates the menu navigation: From the 'Monitor menu' (displaying F0-1 value), press and hold SET for 2 seconds to enter the 'First level menu' (F0---). Press OK to enter the 'Secondary menu' (F0-0), then OK again for the 'Three level menu' (parameter value). Use Up/Down arrows to modify parameter values. Press OK to save and return to the previous menu (parameter number automatically increments). Press SET to return to the previous menu without saving. Long pressing the Up
or Down 
buttons allows for rapid adjustment of values.Special Note: In the third-level menu, pressing OK saves the modified parameter value and returns to the previous menu, automatically incrementing the parameter number. Pressing SET directly returns to the previous menu without saving changes. Long pressing the Up or Down buttons allows for quick adjustment of values.
6. Parameter Description
6.1. F0 Attendant Array Display
| Parameter | Parameter Name | Scope and Description | Defaults | Read/Write |
|---|---|---|---|---|
| F0-0 | Collected value monitoring | Monitors the percentage of the current analog input value. Range: 0-100.0% | Read-only | |
| F0-1 | Display value monitoring | The display value in "Monitoring Menu" is calculated by F0-0, F0-2~F0-4. | Read-only | |
| F0-2 | Display accuracy | The number of decimal places displayed in the "Monitor Menu", range: 0-3. | 1 | Read/Write |
| F0-3 | Show minimum | In the "Monitoring Menu", the value corresponding to "acquisition value" is 0%. Range: -1999~9999 | 0 | Read/Write |
| F0-4 | Show maximum | In the "Monitoring Menu", the value corresponding to the "Acquisition Value" is 100.0%. Range: 1999~9999 | 1000 | Read/Write |
| F0-5 | Offline status | 0: Not disconnected; 1: Disconnected. (Disconnection detection is set by F1-4) (starting from V2.10) | Read-only |
6.2. F1 Parameter Group - Analog Configuration Parameters
| Parameter | Parameter Name | Scope and Description | Defaults | Read/Write |
|---|---|---|---|---|
| F1-0 | Input type selection | 0: 0~10V or 0~20mA corresponds to 0~100.0%; 1: 2~10V or 4~20mA corresponds to 0~100.0%, and 0 when it is lower than 2V or 4mA. | 0 | Read/Write |
| F1-1 | Input filter time | Analog input filter time, range: 0~10.000s. Longer time means stronger filtering. | 0.200 | Read/Write |
| F1-2 | Input gain | Range: 0~1000.0%. | 100.0 | Read/Write |
| F1-3 | Input offset | -99.9~99.9%, with 10V or 20mA as 100.0%. | 0.0 | Read/Write |
| F1-4 | Drop detection threshold | Range: 0.0-100.0%. This value is based on 0-10V or 0-20mA as 0.0-100.0% as a reference (and F1-0 and gain offset are not related). Detection is not started if less than 0.5, with a hysteresis of ±0.3. When input signal is lower than this value, meter displays E.oFL. (Starting from V2.10) | 0.0 | Read/Write |
| F1-5 | Enter the parameter setting selection | 0: Long press SET button for 3s to enter parameter setting mode; 1: Keep pressing SET button for more than 3s, and press OK to enter parameter setting mode. | 0 | Read/Write |
Analog Input Calculation: The adjustment result is calculated as: (collected value + offset) × gain. The result is limited to 0.0% to 100.0%. Values greater than 100.0% are capped at 100.0%, and values less than 0.0% are set to 0.0%.
6.3. F2 Parameter Group - Relay Output Dosing (for 'with Relay Output version' only)
| Parameter | Parameter Name | Scope and Description | Defaults | Read/Write |
|---|---|---|---|---|
| F2-0 | Relay output status configuration | When output conditions are met: 0: No control (always open); 1: Relay closed; 2: Relay open (not satisfied, closed on condition) | 0 | Read/Write |
| F2-1 | Condition type | 0: Greater than comparison value 1; 1: Less than comparison value 2; 2: Greater than comparison value 1 AND less than comparison value 2. | 0 | Read/Write |
| F2-2 | Comparison value 1 | Range: 0-100.0% | 50.0 | Read/Write |
| F2-3 | Comparison value 2 | Range: 0-100.0% | 50.0 | Read/Write |
| F2-4 | Hysteresis interval | Prevents frequent relay operation near comparison value. Range: 0.0%~80.0%. | 5.0 | Read/Write |
| F2-5 | Relay status when offline | When F1-4 offline condition is met, the relay output state. Priority over comparison relay output. 0: Not used; 1: Relay closed; 2: Relay disconnected (starting from V2.10) | 0 | Read/Write |
Hysteresis Interval Example: If F2-1 is "greater than comparison value 1", F2-2 is 50.0%, and F2-4 (hysteresis) is 5.0%. When the collected value increases and exceeds 50.0% + 5.0%/2, the output condition is met. If the value then decreases, it must fall below 50.0% - 5.0%/2 to cease the output condition.
6.4. F7 Communication Parameters and Software Version (for 'with RS485 version' only)
| Parameter | Parameter Name | Scope and Description | Defaults | Read/Write |
|---|---|---|---|---|
| F7-0 | Local address | Range: 1~247 | 1 | Read/Write |
| F7-1 | Baud rate | 0: 1200bps; 1: 2400bps; 2: 4800bps; 3: 9600bps; 4: 19200bps; 5: 38400bps | 3 | Read/Write |
| F7-2 | Data Format | 0: 8,1, None (8 data bits, 1 stop bit, no parity); 1: 8,1, Even (8 data bits, 1 stop bit, even parity); 2: 8,1, Odd (8 data bits, 1 stop bit, odd parity); 3: 8,2, None (8 data bits, 2 stop bits, no parity) | 0 | Read/Write |
| F7-3 | Response delay | Communication response delay time 0~500ms | 5 | Read/Write |
| F7-4 | Communication type | 0: Display table is Modbus slave, user host can read collected values; 1: Display table is network slave between tables, receives data from master; 2: Display table is network host between tables, sends display value via broadcast; 3: Display table is network host between tables, sends display value via address polling (range 1~F70 value). (Use above V1.02) | 0 | Read/Write |
| F7-5 | Parameter recovery | Set to 111 to restore parameters to factory settings; other values are invalid. | 1313 | Read-only |
| F7-6 | Model code | Module model code 0521H | 0.1 | |
| F7-7 | Send interval time | The interval time for the host to send data during master-slave communication. Range: 0.1~100.0s | Read/Write | |
| F7-8 | Software version number | Module software version number, two decimal places. E.g., 1.00 corresponds to v1.00. | Read-only |
7. Communication Protocol (for 'with RS485 communication version' only)
7.1. User Host Access to Collected Value
The communication utilizes the standard Modbus-RTU protocol. Use the multi-read instruction 03H to read data. The returned parameter value is an integer, representing the display value of the digital tube with the decimal point removed. For example, if the F0-0 digital tube displays 60.0, the communication will read 600. Modbus register addresses correspond directly to parameters (e.g., F7-2 corresponds to Modbus address 0702H).
Example: Reading F0-0 and F0-1 parameters (with default F7 parameters):
| Host Sends | Value | Slave (HXDSBOXAI) Response | Value |
|---|---|---|---|
| Slave address (F7-0) | 01H | Slave address (F7-0) | 01H |
| Modbus function number | 03H | Modbus function number | 03H |
| Start address (high byte) | 00H | Returns the number of bytes (4 bytes) | 04H |
| Start address (low byte) | 00H | High byte of address content (F0-0) | 02H |
| Read word count (high byte) | 00H | Low byte of the content of 000 address (F0-0) | 58H |
| Read word count (low byte) | 02H | High byte of 0001H address content (F0-1) | 02H |
| CRC (low byte) | C4H | Low byte of 0001H address content (F0-1) | 58H |
| CRC (high byte) | 0BH | CRC (low byte) | 7AH |
| CRC (high byte) | C2H |
In this example, the read F0-0 and F0-1 values are 0258H = 600, meaning the collected value F0-0 is 60.0% and the displayed value F0-1 is 60.0.
7.2. Networking Between Tables
The RS485 interface allows for networking multiple display meters. A master meter can transmit its collected data to slave meters for display. A network can only have one master table but multiple slave tables. Only the master table needs to have its display range configured; slave tables do not require this.
7.2.1. Broadcast Mode Network Diagram (F7-4 = 2)
This diagram shows a 'Primary table' (master) with F7-0=3 and F7-4=3, connected via an RS485 total line to three 'From table' (slave) units, each with F7-0=1 and F7-4=1. In this mode, the master broadcasts data to all slaves.
Advantages of Broadcast Mode: Simple setup with fewer parameters. All slave meters only need to set one parameter (F7-4 = 1). Fast networking.
7.2.2. Address Polling Network Diagram (F7-4 = 3)
This diagram shows a 'main table' (master) with F7-4=2, connected via an RS485 total line to three 'From table' (slave) units, each with F7-4=1. In this mode, the master polls each slave individually for data.
Advantages of Address Polling: Each slave display table can return data, allowing for network connectivity verification via the master meter's receiving indicator. However, each meter requires individual parameter settings.
7.3. Operating as a Modbus-RTU Display Slave (Applicable to V1.02 and above)
Set parameter F7-4 to 1. In this mode, parameters F0-1 (register address 01H) and F0-2 (register address 02H) can be modified using Modbus-RTU 06H and 10H commands. The meter's display will no longer be associated with analog quantity collection. The device address is set by the F7-0 parameter.
Example (assuming F7-0 = 1, F7-4 = 1):
- Writing 16.88 data to the meter (F0-1 is 1688, F0-2 is 2): The meter will display 16.88 upon reception.
Host sends:01 10 00 01 00 02 04 06 98 00 02 32 C5
Table response:01 10 00 01 00 02 10 08 - Setting F0-2 to 1 (one decimal place) and writing 1234 to register 01 (F0-1): The meter will display 123.4.
Host send (06H write):01 06 00 01 04 D2 5A 97
Table response (06H write):01 06 00 01 04 D2 5A 97
OR
Host send (10H write):01 10 00 01 00 01 02 04 D2 25 1C
Table response (10H write):01 10 00 01 00 01 50 09
8. User Tips
- Configuration: Many users inquire about configuration. Always refer to the parameter tables (F0, F1, F2, F7) and the menu navigation flowchart (Figure 5.2) for precise adjustments.
- Analog Sensor Compatibility: This meter is confirmed to read 4-20mA sensors. Ensure correct wiring as per Figure 4.1 and configure F1-0 for the appropriate input type.
- Manual Adjustment: Displayed numbers can be manually increased or decreased using the Up and Down arrow buttons during parameter setting. Long-press for faster changes.
- Offline Status: If the meter displays 'E.oFL', check the input signal against the F1-4 drop detection threshold.
9. Troubleshooting
- No Display/Incorrect Reading:
- Verify power supply connections (PWR, GND) and ensure voltage is within the specified range for your model.
- Check analog input wiring (Ai, mA) for correct polarity and connection.
- Ensure F1-0 (Input type selection) is correctly set for your sensor (0-10V, 2-10V, 0-20mA, or 4-20mA).
- If using current input, confirm that Ai and mA terminals are short-circuited.
- Check F1-2 (Input gain) and F1-3 (Input offset) parameters if the displayed value is incorrect but the input signal is present.
- 'E.oFL' Displayed: This indicates an offline status. Check the input signal level. If it falls below the F1-4 (Drop detection threshold) value, this error will appear.
- Relay Not Activating (Relay Output Version):
- Verify F2-0 (Relay output status configuration) is set to 1 (Relay closed) or 2 (Relay open) as desired.
- Check F2-1 (Condition type), F2-2 (Comparison value 1), and F2-3 (Comparison value 2) to ensure the conditions for relay activation are met.
- Consider the F2-4 (Hysteresis interval) which prevents rapid switching.
- If F2-5 (Relay status when offline) is configured, an offline condition might override normal relay operation.
- RS485 Communication Issues (RS485 Version):
- Check RS485 wiring (485+, 485-) for correct polarity and secure connections.
- Ensure F7-0 (Local address), F7-1 (Baud rate), and F7-2 (Data Format) match the settings of your Modbus master device.
- Observe the R and T indicator lights on the front panel to confirm data transmission and reception.
- If networking multiple meters, ensure F7-4 (Communication type) is correctly set for master/slave roles.
- Parameter Reset: If configuration becomes problematic, you can restore factory settings by setting F7-5 to 111.
10. Maintenance
- Cleaning: Use a soft, dry cloth to clean the display and casing. Do not use abrasive cleaners or solvents.
- Environmental Conditions: Operate the device within its specified environmental limits to ensure longevity. Avoid exposure to extreme temperatures, humidity, or corrosive environments.
- Firmware Updates: Check the manufacturer's website for any available firmware updates. Follow instructions carefully if performing an update.
- Regular Checks: Periodically inspect wiring connections for looseness or damage.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.
