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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.
| 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 |
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