Hioki RM3545, Instruction Manual, Page: 235 / 364

11.2 Preparations before Use (Connections and Settings)
227
11
Connecting a controller with a 9-pin D-sub male port
Use a crossover cable with female 9-pin D-sub connectors.
Connecting a controller with a 25-pin D-sub female port
Use a crossover cable with a female 9-pin D-sub and a male 25-pin D-sub connector.
As the figure shows, RTS and CTS pins are shorted together and crossed to DCD in the
other connector.
Recommended cable: HIOKI Model 9637 RS-232C Cable (1.8 m)
Crossover Wiring
Female 9-pin D-sub
RM3545-end
Female 9-pin D-sub
PC/AT-end
Pin No. Pin No.
DCD 1 1 DCD
RxD 2 2 RxD
TxD 3 3 TxD
DTR 4 4 DTR
GND 5 5 GND
DSR 6 6 DSR
RTS 7 7 RTS
CTS 8 8 CTS
9 9
Recommended cable: HIOKI Model 9638 RS-232C Cable
Crossover Wiring
Female 9-pin D-sub
RM3545-end
Male 25-pin D-sub
PC-end
Pin No. Pin No.
DCD 1
RxD 2 2 TxD
TxD 3 3 RxD
DTR 4 4 RTS
GND 5 5 CTS
DSR 6 6 DSR
RTS 7 7 GND
CTS 8 8 DCD
9 20 DTR
Note that the combination of a dual
male 25-pin D-sub cable and a 9- to
25-pin adapter cannot be used.