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MODBUS interface
The COM16 module is equipped with a 2-wire RS485 interface. The MODBUS connector is a 9-pin female Sub-D connector with the
following pinout:
The cable shielding must be connected to the circuit breaker's protective grounding to prevent EMF disturbances being channeled into the
module.
Write Enable input
The COM16 Module is equipped with an input that must be activated to allow the module to accept remote control commands as well as
remote parameterization. When this input is not active, the module will reject all incoming packets that would normally change the state of
an output (open/close circuit breaker) or change protective parameters. Normal polling and communication of data are not affected.
The following commands are blocked if the Write Enable input is inactive:
- opening/closing circuit breaker
- resetting after a trip
- Changing any protective function parameters and extended protective function parameters
- changing any communications parameter (e.g. address)
- changing any parameter of the metering function (e.g. demand period length)
- resetting any diagnostic or service-related counter or indicator
- setting/resetting outputs of the digital output modules
The following commands are always allowed, independent of the state of the Write Enable input:
- changing and setting the trigger settings of the waveform capture function
- reading the contents of the waveform buffer
- changing alarm and setpoint function settings
- changing any of the customer-changeable text strings
- resetting the min/max log
- setting/resetting the "Free Output" of the COM16 module
- setting system time
Pin
1 COMMON
5 Transceiver Terminal 1, V1 voltage
9 Transceiver Terminal 0, V0 voltage
2-4, 6-8 Not connected
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