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36
Model BB4000 Controller Instruction Manual
15. rs232 s
erIal
p
ort
The RS232 serial port allows a SCADA system to communicate with the Controller using the
Modbus RTU protocol.
Setup of RS232 Serial Port
The controller’s RS232 serial port must be setup to communicate with the device it is connected
to. The Baud Rate, Parity Mode and Stop Bits Parameter values of the two devices must be set to
match.
The Delay Before Response Parameter (P.32) is provided for cases where the modem needs
additional time to prepare itself before receiving a response back from the controller.
p
araMeter
D
efault
V
alue
c
urrent
V
alue
S
etting
D
efinitionS
P.29
4
Baud Rate
1 = 1200 bps 2 = 2400 bps 3 = 4800 bps 4 = 9600 bps
P.30
0
Parity Mode
0 = No Parity 1 = Odd Parity 2 = Even Parity
P.31
2
Stop Bits
1 = 1 Stop Bit 2 = 2 Stop Bits
(The 2
nd
Stop Bit is available only when No Parity is selected)
P.32
1 ms
Delay Before Response Range: 1 - 100 ms