Hardware Style Owner's manual

Appendix C
RS-232 Communication Interface
C–6
IBM AT to a Modem (Hardware Handshaking Enabled)
DCD
RI
1
2
3
4
5
6
7
8
9
8
3
2
20
7
6
4
5
22
RXD
TXD
DTR
COM
DSR
RTS
CTS
GND 1
1
3
3
4
5
6
7
8
9
8
2
2
20
7
6
4
5
22
DCD
RI
RXD
TXD
DTR
COM
DSR
RTS
CTS
9 Pin25 Pin
IBM AT
9 Pin 25 PinModem
➀
(DTE) (DCE)
➀
Connect to the shield of the cable.
IBM AT to a 5/03 Processor, 1770–KF3, 1775–KA, 1773–KA, 5130–RM,
or PLC–5 (Hardware Handshaking Disabled)
➀
DCD 1
3
2
4
5
6
7
8
8
2
3
20
7
6
4
5
TXD
RXD
DTR
COM
DSR
RTS
CTS
GND 1
1
3
3
4
5
6
7
8
9
8
2
2
20
7
6
4
5
22
DCD
RI
RXD
TXD
DTR
COM
DSR
RTS
CTS
9 Pin25 Pin IBM AT
9 Pin 25 Pin
(DTE) (DTE)
➁
➁
Peripheral
➁
➁
Device
➂
➀
You can also use cable 1747-CP3.
➁
Jumpers are only needed if you cannot disable the hardware handshaking on the port.
➂
Connect to the shield of the cable.