4.1 RS-232C Settings and Connection (Before Using Command Communications)
121
Computer
Use a crossover cable with female 9-pin D-sub connectors.
Recommended cable: Model 9637 RS-232C Cable (1.8 m, 9pin-9pin, crossover cable)
Device with D-sub 25-pin connector
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: Model 9638 RS-232C Cable (1.8m, 25pin-9pin, crossover cable)
Note that the combination of a dual male 25-pin D-sub cable and a 9- to 25-pin adapter cannot be used.
Female 9-pin D-sub
PW3336, 3337-end
Female 9-pin D-sub
Computer/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
RI 9 9 RI
Crossover Wiring
Female 9-pin D-sub
PW3336, 3337-end
Male 25-pin D-sub
Computer-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
RI 9 20 DTR
Crossover Wiring
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