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RX Series
Digital Solid State protection Relays 5 - 2000A
5.6.10 Communications
The RX Series relay is shipped from the factory ready to accept
RS-485 Serial Communications using Modbus RTU protocol. Additional
detailed instructions on accomplishing communications are available in
a Serial Communication Supplement to this manual. F060 – F062 are
used to set the communications parameters in the relay.
F060 = Remote Relay Control via Comm. Port
Factory Setting = 0 (disabled)
Range = 0 – 4
Use this to program how the RX Series relay is to be controlled
when using serial communications.
When F060 = 0, Communication is disabled.
When F060 = 1, the relay can be monitored only by the Comm
port, but not controlled. The Modbus RTU protocol uses an 11
bit format.
When F060 = 2, the relay can be monitored only by the Comm
port, but not controlled. The Modbus RTU protocol uses a 10 bit
format.
When F060 = 3, In this mode, a hard-wired Start command is
“ANDed” with Comm port logic; both Start commands must be
on for the RX to allow a start. The Stop function is “ORed”
;either the Comm. Port Stop command OR the hard-wired Stop
(removal of Start) will cause the RX to stop. This setting uses
an 11 bit format.
When F060 = 4, Same as above, except this setting will work
with 10 bit formats.
F061 = Baud Rate
Factory Setting = 9.6 KB
Range = 4.8 to 19.2 KB
Set value to either 4.8 KB, 9.6 KB or 19.2 KB to match the
setting of the host device.
F062 = Modbus Address
Factory Setting = 1
Range = 1 – 247
The Modbus communications protocol allows each node to
have up to 247 connected devices but each must have a unique
address. Two devices with the same address will result in a
communications error.
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