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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.
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| Applications |
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The M-Bus (Meter‐Bus) is a bus optimized for the reading of measurement instruments like: energy counters, hot and cold water counters, gas, pressure, sensors and actuators, etc.….
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| Features |
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- 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
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| Baud Rate Selection by Rotary Switch |
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| Switch Value |
0 |
1 |
2 |
3 |
4 |
5 |
| Baud [bps] |
300 |
600 |
1200 |
2400 |
4800 |
9600 |
| Switch Value |
6 |
7 |
8 |
9 |
A ~ F |
| Baud [bps] |
19200 |
38400 |
57600 |
115200 |
User-defined |
The data format of serial bus baud rate of switch value 0 ~ 9 is 8, n, 1.
The data format of M-Bus bus baud rate of switch value 0 ~ 3 is 8, e, 1. |
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| Execution Mode by DIP Switch |
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| DIP 1 (Init) |
DIP 2 (Mode) |
Description |
| OFF |
OFF |
Run Firmware |
| OFF |
ON |
Configure |
| ON |
OFF |
Update Firmware |
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| Utility |
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- Provide M-Bus and serial bus user-defined baud rate
- Check firmware version
- Configure meters list of M-Bus gateway
- Test reading meters data
- Update firmware
   
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| Support Meter |
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The following meters have been tested with the GW-7828 communication:
| Manufacture |
Picture |
Model Type |
Meter Type |
| Danfoss |
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SONOMETER 500 |
Heat Meter |
| SENSUS |
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405S |
Water Meter |
| WESER |
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PUL |
Heat Meter |
| DIEHL |
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ALTAIR V4 |
Water Meter |
| Wason |
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LXZD-Y3 |
Water Meter |
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| Hardware Specifications |
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| M-Bus Interface |
| Channel |
1 |
| Baud Rate (bps) |
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 |
| ESD Protection |
Contact ±4 kv class B |
| Current Protection |
short-circuit protection |
| UART Interface |
| Channel |
1 RS-232 / RS-422 / RS-485 (can't be used simultaneously) |
| Baud Rate (bps) |
300 bps ~ 115200 bps |
| Data bit |
5, 6, 7, 8 |
| Stop bit |
1, 2 |
| Parity |
None, Even, Odd, Space, Mark |
| ESD Protection |
Contact ±4 kv class B |
| Power |
| Power Supply |
Unregulated +10 ~ +30 VDC |
| Protection |
Power reverse polarity protection, Over-voltage brown-out protection |
| Power Consumption |
1.8 W @ 24 VDC (with 1 slave device)
11.8 W @ 24 VDC (with 100 slave devices) |
| Mechanical |
| Installation |
DIN-Rail |
| Dimension (W x L x H) |
72mm x 122mm x 33mm |
| Environment |
| Operating Temperature |
-25 to +60°C |
| Storage Temperature |
-40 to +80°C |
| Relative Humidity |
10 to 90% RH, Non-condensing |
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| Ordering Information |
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Modbus RTU Slave to M-Bus Master Gateway (RoHS) |
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| Optional Accessories |
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| CA-0910 |
9-pin Female D-sub & 3-wire RS-232 cable (1M) |
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| TOP |
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