Modbus
Several Multitek products have the option to include RS485 based Modbus communications.
Modbus meter ranges:
M802, M812, M842, M850 and M880.
Modbus transducer ranges:
M55x, M560 and M570.
Modbus Manual (HTML)
BACnet
The M850-BAC is an RS485 based BACnet meter.
ASHRAE Home Page
Ethernet
The M850 multifunction power meter accepts a plug-in Ethernet module.
It enables the meter to communicate with computers over the popular ethernet network.
Supported protocols are:
Modbus TCP (port 4000), Modbus TCP/IP (port 502), Telnet (port 23) and HTTP (port 80).