SG485-3
INTERFACE EXPANSION MODULE
USER MANUAL
SG485-3 Interface Expansion Module
SMARTGEN (ZHENGZHOU) TECHNOLOGY CO., LTD.
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Table 1 Software Version
| Date | Version | Note |
| 2021-06-08 | 1.0 | Original release. |
| 2021-07-19 | 1.1 | Update pictures in the manual. |
| 2021-11-06 | 1.2 | Update pictures in the manual. |
OVERVIEW
SG485-3 is the expansion module of the RS485 interface, which has 3 interfaces, namely the RS485 host interface, RS485 slave 1 interface, and RS485 slave 2 interfaces. It can convert 1# RS485 interface to 2# RS485 interface, providing convenience for customers to monitor and collect data via Modbus-RTU protocol.
PERFORMANCE AND CHARACTERISTICS
Its main characteristics are as follows:
─ With 32-bit ARM SCM, high hardware integration, and improved reliability;
─ DC(8~35)V continuous power supply;
─ 35mm guide rail installation method;
─ Modular design and pluggable connection terminals; compact structure with easy mounting.
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 a 120Ω shielded twisted pair line is applied. Stop bit: 1-bit’ Parity bit: None |
| Case Dimension | 71.6mmx92.7mmx60.7mm (LxWxH) |
| Working Temperature | (-40~+70)°C |
| Working Humidity | (20~93)%RH |
| Storage Temperature | (-40~+80)°C |
| Protection Level | IP20 |
| Weight | 0.14kg |
WIRING
Fig.1 Mask Diagram
Table 3 Indicators Description
| No. | Indicator | Description |
| 1. | POWER | Power indicator, always on when powered on. |
| 2. | RS485 | RS485 HOST communication indicator flashes 100ms when sending or receiving data. |
| 3. | RS485(1) | RS485 SLAVE(1) communication indicator, flashes 100ms when sending or receiving data. |
| 4. | RS485(2) | RS485 SLAVE(2) communication indicator, 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 is positive. | |
| 3. |
RS485 HOST |
TR |
0.5mm2 |
RS485 host interface communicates with controller, TR can be shortly connected with A(+), which is equivalent to connecting 120Ω matching the resistor between A(+) and B(-). |
| 4. | A(+) | |||
| 5. | B(-) | |||
| 6. |
RS485 SLAVE(1) |
TR |
0.5mm2 |
RS485 slave interface communicates with PC monitoring interface, TR can be shortly connected with A(+), which is equivalent to connecting 120Ω the matching resistor between A(+) and B(-). |
| 7. | A(+) | |||
| 8. | B(-) | |||
| 9. |
RS485 SLAVE(2) |
B(-) |
0.5mm2 |
RS485 slave interface communicates with PC monitoring interface, TR can be shortly connected with A(+), which is equivalent to connecting 120Ω the matching resistor between A(+) and B(-). |
| 10. | A(+) | |||
| 11. | TR | |||
Table 5 Communication Address Setting
| Communication Address Setting | ||||||||
| Address | Host Address | Slave 1 Address | Slave 2 Address | |||||
| Dial Switch No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|
The corresponding relation between dial switch combination and communication address |
00:1 | 000:1 | 000:1 | |||||
| 01:2 | 001:2 | 001:2 | ||||||
| 10:3 | 010:3 | 010:3 | ||||||
| 11:4 | 011:4 | 011:4 | ||||||
| / | 100:5 | 100:5 | ||||||
| / | 101:6 | 101:6 | ||||||
| / | 110:7 | 110:7 | ||||||
| / | 111:8 | 111:8 | ||||||
ELECTRICAL CONNECTION DIAGRAM
This module is applied for the expansion of the RS485 interface, which can convert 1# RS485 interface to 2# RS485 interface. Common connection examples are as follows: 
OVERALL DIMENSION AND INSTALLATION
SmartGen — make your generator smart
SmartGen Technology Co., Ltd.
No.28 Jinsuo Road
Zhengzhou
Henan Province
P. R. China
Tel: +86-371-67988888/67981888/67992951 +86-371-67981000(overseas)
Fax: +86-371-67992952
Web: www.smartgen.com.cn/
www.smartgen.cn/
Email: sales@smartgen.cn
Documents / Resources
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SmartGen SG485-3 Interface Expansion Module [pdf] User Manual SG485-3, Interface Expansion Module, SG485-3 Interface Expansion Module, Expansion Module, Module |
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SmartGen SG485-3 Interface Expansion Module [pdf] User Manual SG485-3, Interface Expansion Module, SG485-3 Interface Expansion Module, Expansion Module, Module |
