M-Bus

GW-7828 CR is a gateway that lets Modbus RTU masters read data from M-Bus (Meter-Bus) slave devices. It is intended for remote reading of consumption meters, and also for sensors and actuators that use the M-Bus standard. Engineers can integrate M-Bus devices into an existing Modbus RTU system without writing M-Bus drivers.The gateway responds to Modbus RTU function codes 0x03 and 0x04 to read M-Bus meter data, and supports up to 100 M-Bus slave devices. Serial communication is available through RS-232, RS-422 or RS-485, and two rotary switches set the baud rates for the serial port and the M-Bus port.The M-Bus port includes over-current and short-circuit protection, with 3750 Vrms photo-coupler isolation. Firmware can be updated through the serial port. Power consumption is 1.8 W at 24 VDC with one slave device and 11.8 W with 100 slave devices.ApplicationsEnergy countersHot and cold water countersGas metersPressure sensorsM-Bus sensors and actuators

GW-7838-M bridges Modbus TCP/RTU networks and M-Bus metering. It acts as an M-Bus master, reading meter data from up to 100 slave devices, and presents that data as a Modbus TCP server, so a PLC or PC can collect readings without any M-Bus knowledge.The gateway is set up once with the M-Bus configuration utility. After that it reads the meters autonomously. A Modbus client can then access the data over Ethernet (TCP) or the RS-232 serial port, with Modbus function codes 0x03 and 0x04 used to read meter values.Supports EN 13757 and CJ/T 188 M-Bus metersSuited to energy, water, heat and gas meter reading in automation systemsApplicationsReading energy countersHot and cold water metersHeat metersGas and pressure metersSensors and actuators on an M-Bus network

The I-3591 M-Bus repeater strengthens the drive capability of an M-Bus line, extends its cable distance, and reshapes the signal waveform so that the M-Bus master can communicate reliably with a larger number of meters.It suits engineers building metering networks for electricity, water and heat meters, where the two-wire M-Bus carries both power and communication. The unit needs no configuration: it detects the baud rate automatically once it is wired into the line. Its overcurrent, short-circuit and reverse polarity protection help it withstand common wiring faults.The I-3591 CR is the RoHS-labelled version of the repeater. It provides one master port and one slave port, with 3750 Vrms photo-coupler isolation, and mounts on a DIN rail. Power consumption is 1.6 W at 24 VDC with one slave device and 9.7 W with 100 slave devices.ApplicationsElectricity, water and heat meter networksM-Bus metering installations with large numbers of slave devicesLong-distance M-Bus cable runs

The I-7590 bridges a serial host to M-Bus (Meter-Bus) slave devices. It accepts RS-232, RS-422 or RS-485 on the serial side and passes data through to the M-Bus network, so a standard serial master can poll energy counters, water and gas meters, and other M-Bus instruments without a custom protocol stack.Serial and M-Bus baud rates can be configured separately. Ten default baud rates and six user-defined rates are available, allowing the converter to match a wide range of meter configurations. Transparent communication means the converter does not alter the data stream, and it supports up to 100 M-Bus slaves.For reliability in the field, the M-Bus port has 3750 Vrms photocoupler isolation along with overcurrent and short-circuit protection. The unit also includes a watchdog, reverse polarity protection on the power input, and firmware can be updated through the RS-232 port. It mounts on DIN-rail and is rated for -25 ~ +75 ℃ operation.ApplicationsRemote reading of energy countersHot and cold water meter readingGas meter and gas counter readingPressure sensors and actuators on M-Bus networks