- 2 digital inputs, to select the tariff, detect the logic state of external signals or as act  
  as an impulse input.
  - 2 transistor digital outputs, fully programmable. 
  - 2 relay digital outputs, fully programmable.
  - RS-485 communications, with two serial protocols: MODBUS RTU ® and BACnet.
The CVM-B can be expanded with the following expansion modules:
   M-CVM-AB-8I-8OTR, expansion module with 8 transistor digital inputs and 8 tran-
sistor digital outputs.
  M-CVM-AB-8I-8OR, expansion module with 8 relay digital inputs and 8 relay digital 
outputs.
 
   M-CVM-AB-4AI-8AO, expansion module with 4 analogue inputs and 8 analogue out 
  puts.
 
 M-CVM-AB-Modbus/TCP(Bridge), expansion  module  for  connecting  the  unit  to  a 
Modbus/TCP network  and as an Ethernet to RS-485 gateway.  
 M-CVM-AB-LON, expansion module for connecting the unit to a LonWorks network.
 M-CVM-AB-Probus, expansion module for connecting the unit to a Probus network.
 M-CVM-AB-MBus, expansion module for connecting the unit to a M-Bus network.
 M-CVM-AB-Datalogger, expansion module that can be used  to store data in the em-
bedded PowerStudio platform integrated in the module.
 M-CVM-AB-Modbus/TCP(Switch), expansion  module  for  connecting  the  unit  to  a 
Modbus/TCP network  and as an Ethernet to Ethernet gateway. 
9
Instruction Manual
CVM-B100 - CVM-B150