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Connection
29
Serial input/output (RS-485/RS-232C)
This equipment is provided with RS-485 (standard) or RS-232C (option) input/output
terminals.
Specifications are as described below.
For details on the commands, refer to “ Modbus” (page 161).
Terminal allocation
Terminal allocations are shown below.
Cable specifications
Equipment side
PC side
(3-pin stripped wire or round pins)
(D-SUB 9-pin female connector)
Interface
Configured at the factory
RS-485 (standard)
RS-232C (option)
Protocol
Modbus-RTU
Communication speed
Select one of the following:
38400 bps
19200 bps
9600 bps
Parity
Select one of the following:
NONE
ODD
EVEN
Stop bit
1 Stop bit (when ODD or EVEN is selected for
parity)
2 Stop bit (when NONE is selected for parity)
Communication mode Half duplex
Terminal No.
Input/output No.
RS1
TXD/D
RS2
RXD/D
RS3
SG
FG
Name
Pin No.
Pin No.
Name
D
/TXD
1
1
CD
D
/RXD
2
2
RD
SG
3
3
SD
4
ER
5
SG
6
DR
7
RS
8
CS
9
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