In redundant PIM modules, after a switchover, if the alarm for the reported channel still persists on the new primary, this most likely indicates a problem in the field wiring.
The reader should be familiar with the following terms that are used
throughout this instruction manual:
MODBUS: Modbus is a digital data communication protocol which
provides a widely used set of standard commands by
which system data can be communicated to an external
device.
RS485: RS485 is an electrical standard that uses a twisted
pair cable carrying differential signals to transfer digital
data. RS485 permits up to 32 transceiver nodes to be
connected onto a single twisted pair highway for 'multidrop' bi-directional operation over distances up to 1.2km
(3900ft).
RS422: RS422 is an electrical standard that uses a twisted
pair cable carrying differential signals to transfer digital
data. RS422 permits a single driver and up to 10
receiver nodes to be connected onto the highway for
operation over distances up to 1.2km (3900ft).
RS232: RS232 is an electrical standard that uses multi-core
cable carrying signals to transfer digital data. RS232
permits interconnection of two communicating devices
for bi-directional operation over distances up to 15m
(49ft).
Baud Rate: Baud is a unit of signalling speed equal to the number
of discrete signal events per second. (Not necessarily
the same as bits per second).
Bit Rate: The speed at which bits are transmitted, usually
measured in bits per second (bits/s).
Parity: A technique used to detect single bit errors in a
transmitted data byte (character) in electronic code
transmission.
Stop Bit: A method to indicate the end of a transmitted data
byte (character) in electronic code transmission.
Full Duplex: Refers to a communication system capable of
simultaneous two way independent transmission of
data.
Half Duplex: Refers to a communication system capable of
transmission of data in either direction, but not
simultaneously
