Modbus without the cable run
Wire the ZMB to a meter or controller’s serial port and its registers travel over the wireless mesh. The cost that usually dominates a Modbus integration is the cable back to the panel; there is not one.
Modbus Interface
ZMB-3X
Reads and writes Modbus RTU equipment over RS-485 and sends the registers over the Zigbee mesh to the Gateway, so no data cable has to run back to a panel. Up to 30 registers per unit, with an optional temperature probe.
From €399 ex VAT
Works with the Gateway
Features
30 Modbus registers, read and write
Coil, discrete input, input and holding registers, over function codes 1 to 6, 15 and 16. Up to 5 of them in live stream.
Fits your serial bus
- Modbus RTU master
- RS-485
- 300 to 115,200 baud
- Cable runs to 1,000 m
Optional temperature probe
ZMB-30 adds a 2.5 m waterproof temperature probe, so one device returns Modbus data and a temperature reading. ZMB-31 has no probe.
Sealed, with mains on board
A built-in 85–264 V AC supply on a 2 m cable, inside an IP67 polycarbonate enclosure.
Firmware over the mesh
Device firmware updates arrive over the Zigbee network, so an upgrade needs no site visit.
Configure and buy
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Works with
It reports over the Zigbee mesh to the Gateway, which runs Edge on site.
Reads these devices
Used in
-
Modbus meter integration for a BMS or SCADA system
A Modbus interface reads the meters and instruments on site, and Edge serves what it collects onward over Modbus TCP, MQTT or HTTP to the system that needs it. -
Multi-site energy monitoring
A Gateway on every site reads the meters that are already there, applies one point list, and keeps the readings when the connection drops. -
Data centre power monitoring and PUE inputs
Meter the facility incomer, UPS and IT supplies, and get matched energy totals for PUE and capacity reviews. -
Water consumption monitoring for commercial buildings
Bring main and branch water meters into Edge through a Pulse Counter, keep each meter’s units and totals, and compare like-for-like periods. -
Refrigeration energy monitoring
Meter the whole refrigeration plant, split out compressors and fans, and compare periods with the same controller state and load. -
HVAC energy monitoring for commercial buildings
Separate HVAC electricity by supply, see what runs outside the agreed schedule, and choose which heating, cooling, fan or pump system to look at first.
More applications for this product
- Solar PV monitoring
- Generator remote monitoring
- EV charging load management
- Wired M-Bus heat meter integration
- Chiller performance monitoring
- Heat pump performance monitoring
- Pump performance monitoring
- Compressed air energy monitoring
- Legionella temperature monitoring
- Battery demand response
- Refrigeration demand response
- Boiler performance monitoring
- Cold room and cold store temperature monitoring
- 4-20 mA remote monitoring for process instruments
Questions engineers ask
How many registers can one ZMB read?
How many registers can one ZMB read?
Up to 30, read or write, and up to 5 of them in live stream for readings that need a faster update than the normal reporting interval. A meter that needs more takes a second ZMB.
What about Modbus TCP?
What about Modbus TCP?
Equipment with Modbus TCP on the site network connects to Edge on the ZGW-20 Gateway directly, with no ZMB in between.
Is it a transparent Modbus gateway?
Is it a transparent Modbus gateway?
No. The ZMB polls the registers you configure and reports their values. It does not pass other Modbus traffic through.
Which meters and controllers work with it?
Which meters and controllers work with it?
Any Modbus RTU device on RS-485 at 300 to 115,200 baud that answers function codes 1 to 6, 15 or 16. The Device Directory has register maps for common meters.
How should the RS-485 bus be wired?
How should the RS-485 bus be wired?
As a daisy chain on twisted pair, up to 1,000 m, terminated at both ends and biased once. Our reference covers termination, bias and the common faults.
