In no event is Honeywell liable to anyone for any direct, special, or consequential damages. The information and specifications in this document are subject to change without notice.
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
