Features




- Supports M-Bus standard: EN-13757, CJ/T -188
- Supports Modbus RTU function code 0x03 and 0x04 to read Meter data
- Baud rate: Adjustable by rotary switch from 300 to 115200 bps
- Supports up to 100 M-Bus slaves
- M-Bus over current protection
- Short-circuit protection on the M-Bus
- Update firmware from serial port
- Provides PWR, MTX and MRX 3 LED indicators
The M-Bus ("Meter-Bus") is a standard for remote reading of meters. It is usable for most types of consumption meters as well as for various sensors and actuators. The GW-7828 is specially designed for M-Bus slave device. It offers Modbus RTU communication by three kinds of interface, RS-232, RS-422 and RS-485. On hardware the GW-7828 has two rotary switches for serial port and M-Bus port baud rate. GW-7828 supports Modbus RTU function code 0x03 and 0x04 to read data of M-Bus meters. Through this design, it is easy to communicate with any standard M-Bus slave.
Applications
Specifications
COM Ports | |
Ports | 1 x RS-232 1 x RS-422 (can't be used simultaneously) 1 x RS-485 |
Baud Rate | 300 bps ~ 115200 bps |
Parity | None, Even, Odd, Space, Mark |
Data Bit | 5, 6, 7, 8 |
Stop Bit | 1, 2 |
M-Bus | |
Baud Rate | 300 bps ~ 2400 bps |
Data Bit | 5, 6, 7, 8 |
Stop Bit | 1, 2 |
Parity | None, Even, Odd, Space, Mark |
Isolation | 3750 Vrms for photo-couple |
Current Protection | short-circuit protection |
Power | |
Consumption | 1.8 W @ 24 VDC (with 1 slave device) 11.8 W @ 24 VDC (with 100 slave devices) |
Mechanical | |
Dimensions (mm) | 72 x 122 x 33 (W x L x D) |
Installation | DIN-Rail |
Environmental | |
Operating Temperature | -25°C ~ +60°C |
Storage Temperature | -40°C ~ +80°C |
Humidity | 10 ~ 90% RH, Non-condensing |