Connection Charts
For connecting a printer/PC with a 9-pin RS-232C connector
PBX (9-pin)
Printer/PC (9-pin)
Circuit Type
(EIA)
Signal
Name
Pin No.
Pin No.
Signal
Name
Circuit Type
(EIA)
BB
RD (RXD)
2
BA
SD (TXD)
3
CD
ER (DTR)
4
AB
SG
5
CC
DR (DSR)
6
CA
RS (RTS)
7
CB
CS (CTS)
8
2
RD (RXD)
BB
3
SD (TXD)
BA
4
ER (DTR)
CD
5
SG
AB
6
DR (DSR)
CC
7
RS (RTS)
CA
8
CS (CTS)
CB
For connecting a printer/PC with a 25-pin RS-232C connector
PBX (9-pin)
Printer/PC (25-pin)
Circuit Type
(EIA)
Signal
Name
Pin No.
Signal
Name
Circuit Type
(EIA)
BB
RD (RXD)
2
BA
SD (TXD)
3
CD
ER (DTR)
4
AB
SG
5
CC
DR (DSR)
6
CA
RS (RTS)
7
CB
CS (CTS)
8
1
FG
AA
3
RD (RXD)
BB
2 SD
(TXD)
BA
20
ER (DTR)
CD
7
SG
AB
5
CS (CTS)
CB
6
DR (DSR)
CC
CF
4
RS (RTS)
Pin No.
RS-232C Signals
•
Receive Data (RXD):
…(input)
Conveys signals from the printer or the PC.
•
Transmit Data (TXD):
…(output)
Conveys signals from the unit to the printer or the PC. A "Mark" condition is held unless data or BREAK
signals are being transmitted.
•
Data Terminal Ready (DTR):
…(output)
This signal line is turned ON by the unit to indicate that it is ON LINE. Circuit ER (DTR) ON does not indicate
that communication has been established with the printer or the PC. It is switched OFF when the unit is
OFF LINE.
•
Signal Ground (SG)
Connects to the DC ground of the unit for all interface signals.
•
Data Set Ready (DSR):
…(input)
Installation Manual
219
3.12.1 Connection of Peripherals