SmartGen SG485-3 Interface Expansion Module User Manual
SMARTGEN (ZHENGZHOU) TECHNOLOGY CO., LTD.
1 Overview
The SG485-3 is an expansion module for RS485 interfaces. It features three interfaces: one RS485 host interface and two RS485 slave interfaces (Slave 1 and Slave 2). This module can convert one RS485 interface into two RS485 interfaces, facilitating customers in monitoring and collecting data via the Modbus-RTU protocol.
2 Performance and Characteristics
Key characteristics of the SG485-3 module include:
- Equipped with a 32-bit ARM SCM for high hardware integration and improved reliability.
- Supports a DC (8~35)V continuous power supply.
- Features a 35mm guide rail installation method.
- Modular design with pluggable connection terminals for a compact structure and easy mounting.
3 Specification
Table 2: Performance Parameters
| Items | Contents |
|---|---|
| Working Voltage | DC(8~35)V |
| RS485 Interface | Baud rate: 9600bps, max. communication distance can reach 1,000m when 120Ω shielded twisted pair line is applied. Stop bit: 1-bit. Parity bit: None. |
| Case Dimension | 71.6mm x 92.7mm x 60.7mm (LxWxH) |
| Working Temperature | (-40~+70)°C |
| Working Humidity | (20~93)%RH |
| Storage Temperature | (-40~+80)°C |
| Protection Level | IP20 |
| Weight | 0.14kg |
4 Wiring
Fig. 1 Mask Diagram: This diagram illustrates the front panel of the SG485-3 module, showing indicator lights (POWER, RS485, RS485(1), RS485(2)) and terminal connections numbered 1-11. It includes labels for power (B-, B+), RS485 interfaces (HOST, SLAVE(1), SLAVE(2)) with TR, A(+), B(-) pins, and communication address setting dial switches.
Table 3: Indicators Description
| No. | Indicator | Description |
|---|---|---|
| 1. | POWER | Power indicator, always on when powered on. |
| 2. | RS485 | RS485 HOST communication indicator, it flashes 100ms when sending or receiving data. |
| 3. | RS485(1) | RS485 SLAVE(1) communication indicator, it flashes 100ms when sending or receiving data. |
| 4. | RS485(2) | RS485 SLAVE(2) communication indicator, it flashes 100ms when sending or receiving data. |
Table 4: Wiring Terminals Description
| No. | Function | Cable Size | Remark |
|---|---|---|---|
| 1. | B- | 1.0mm² | DC power negative. |
| 2. | B+ | 1.0mm² | DC power positive. |
| 3. | TR | 0.5mm² | |
| 4. | RS485 HOST A(+) | 0.5mm² | RS485 host interface communicates with controller, TR can be short connected with A(+), which is equivalent to connecting 120Ω matching resistor between A(+) and B(-). |
| 5. | RS485 HOST B(-) | 0.5mm² | |
| 6. | TR | 0.5mm² | |
| 7. | RS485 SLAVE(1) A(+) | 0.5mm² | RS485 slave interface communicates with PC monitoring interface, TR can be short connected with A(+), which is equivalent to connecting 120Ω matching resistor between A(+) and B(-). |
| 8. | RS485 SLAVE(1) B(-) | 0.5mm² | |
| 9. | B(-) | 0.5mm² | |
| 10. | RS485 SLAVE(2) A(+) | 0.5mm² | RS485 slave interface communicates with PC monitoring interface, TR can be short connected with A(+), which is equivalent to connecting 120Ω matching resistor between A(+) and B(-). |
| 11. | TR | 0.5mm² |
5 Electrical Connection Diagram
This module is applied for the expansion of RS485 interface, which can convert 1# RS485 interface to 2# RS485 interface. Common connection examples are as follows:
Fig. 2 Electrical Connection Diagram: This diagram illustrates the connection of the SG485-3 module. A 'Controller' is connected to the RS485 HOST interface (B(-), A(+), TR). Two 'Monitoring Interface' units are connected to the RS485 SLAVE(1) and RS485 SLAVE(2) interfaces, respectively (B(-), A(+), TR). The diagram visually represents the module and its external connections.
Table 5: Communication Address Setting
| Address Dial Switch No. | Communication Address Setting | ||
|---|---|---|---|
| Host Address | Slave 1 Address | Slave 2 Address | |
| 1 | 00:1 | 000:1 | 000:1 |
| 2 | 01:2 | 001:2 | 001:2 |
| 3 | 10:3 | 010:3 | 010:3 |
| 4 | 11:4 | 011:4 | 011:4 |
| 5 | / | 100:5 | 100:5 |
| 6 | / | 101:6 | 101:6 |
| 7 | / | 110:7 | 110:7 |
| 8 | / | 111:8 | 111:8 |
6 Overall Dimension and Installation
Fig. 3 Overall Dimension and Installation (Unit: mm): This figure provides detailed physical dimensions of the SG485-3 module through multiple views (front, side, top, bottom). It indicates key measurements such as width (71.6mm), height (92.7mm), depth (60.7mm), and other related dimensions (e.g., 35.5mm, 98.5mm, 104.7mm) necessary for installation planning. The diagram also shows the terminal block arrangement and the mounting mechanism.
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