This document is an installation manual that introduces the installation, wiring, MODBUS protocol and other information of the BW GasPoint Expansion Module GP-MBUS4.
The BW GasPoint MODBUS Expansion Module is an optional add-on card designed for the 12-bit version of the BW GasPoint. It enables the monitor to interface with a MODBUS system using a suitable controller as a master device. The module is fully compatible with BW GasPoint Monitors having serial numbers starting with '3-' or higher.
| Communications Protocol | MODBUS RTU slave |
|---|---|
| Baud rates | 1200, 2400, 9600, 19200 bps field selectable |
| Word length | 8 bits |
| Electrical interface | RS 485 |
| Duplex mode | Half Duplex (2 or 4 wire field selectable) |
| MODBUS addressable range | 1-247 |
| Max devices on network | 32 |
| Supported Function Codes | 3, 5, 6, and 7 |
| Power Supply | Powered by BW GasPoint |
| Power Consumption | <70 mA @ 24 VDC |
The default baud rate setting is 9600 bps.
The default configuration is even parity with one stop bit.
No, the module is powered directly by the BW GasPoint unit.
The module supports function codes 3, 5, 6, and 7.