GW-7838-M
Modbus TCP Server to M-Bus Master Gateway
Features
- Supports M-Bus standard: EN-13757, CJ/T -188
- Supports Modbus TCP/RTU function code 0x03 and 0x04 to read Meter data
- Default M-Bus port data format: Data bit 8, Parity Even, Stop bit 1
- Supports up to 100 M-Bus slaves
- M-Bus over current protection
- Short-circuit protection on the M-Bus
- Update firmware from serial port
- Watchdog inside
Introduction
M-Bus (Meter-Bus) is a communication interface widely used in various meters, such as electricity meters, water meters, heat meters, etc. Ease of installation (two-wire system includes power and communication function) and robustness are the most important features. M-Bus has its own physical layer and protocol. Therefore, it is usually switched to other systems, such as Modbus, to facilitate the overall application.
In the field of automation, Modbus TCP/RTU is one of the most common communication standards. ICP DAS developed the gateway GW-7838-M for Modbus TCP/RTU to M-Bus, allows the direct transmission of meter data to a control system using Modbus TCP/RTU. The GW-7838-M supports operating up to 100 devices on the M-Bus. After an initial configuration by M-Bus utility, GW-7838-M will read out the meters data autonomously. The PLC or PC as a Modbus TCP/RTU client can access meter data via a TCP/RS-232 connection easily.
Applications
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.….
Ordering Information
| PRODUCT SERIES | DESCRIPTION | QNT. | INQUIRY |
|---|---|---|---|
Similar Products
| Ethernet | |
|---|---|
| Ports | 1 x RJ-45, 10/100Base-T(X) |
| Protocol | Modbus TCP |
| COM Ports | |
|---|---|
| Ports | 1 x RS-232, Non-isolated |
| Baud Rate | 300 ~ 115200 bps |
| Parity | None, Even, Odd, Mark, Space |
| Data Bit | 5, 6, 7, 8 |
| Stop Bit | 1, 2 |
| M-Bus | |
|---|---|
| Ports | 1 |
| Baud Rate | 300 ~ 2400 bps and user-defined baud rate |
| 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) | 102 x 123 x 40 (W x H x D) |
| Installation | Wall mounting |
| Environment | |
|---|---|
| Operating Temperature | -25 ~ +75 ℃ |
| Storage Temperature | -30 ~ +80 ℃ |
| Humidity | 10 ~ 90% RH, Non-condensing |
- 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
|
Baud Rate Selection by DIP Switch
|
||||||
| DIP 3 ~ 6 | 0000 | 1000 | 0100 | 1100 | 0010 | 1010 |
| Baud [bps] | 300 | 600 | 1200 | 2400 | 4800 | 9600 |
| DIP 3 ~ 6 | 0110 | 1110 | 0001 | 1001 | Others | |
| Baud [bps] | 19200 | 38400 | 57600 | 115200 | User-defined | |
| The status of DIP bit 0 is OFF and 1 is ON. The default data format of serial bus baud rate is 8, n, 1. The default data format of M-Bus bus baud rate is 8, e, 1. |
||||||
|
Execution Mode by DIP Switch
|
||
| DIP 1 (Init) | DIP 2 (Mode) | Description |
|---|---|---|
| OFF | OFF | Run Firmware |
| OFF | ON | Configure |
| ON | OFF | Update Firmware |
|
Support Meter
The following meters have been tested with the GW-7838-M communication: |
|||
| Manufacture | Picture | Model Type | Meter Type |
|---|---|---|---|
| Danfoss |  |
SONOMETER 500 | Heat Meter |
| SENSUS |  |
405S | Water Meter |
| WESER |  |
PUL | Heat Meter |
| DIEHL |  |
ALTAIR V4 | Water Meter |
| Wason |  |
LXZD-Y3 | Water Meter |
