1. Make
sure that both connector cases (frame ground) of the RS-232C cross cable (shielded cable) are
conductive. If they are not conductive, make sure that both connector cases of the cable are firmly
connected.
2. If this is not possible, connect the frame of the PBX to the frame of the PC/Printer using an earthing
wire in order to prevent difference in the electrical potentials.
Pin Assignments
No. Signal Name Function
Circuit Type
EIA CCITT
2 RD (RXD) Receive Data BB 104
3
4
SD (TXD)
ER (DTR)
Transmit Data
Data Terminal Ready
BA
CD
103
108.2
5
6
SG
DR (DSR)
Signal Ground
Data Set Ready
AB
CC
102
107
7
8
RS (RTS)
CS (CTS)
Request To Send
Clear To Send
CA
CB
105
106
Connection Charts
For connecting a printer/PC with a 9
-pin RS-232C connector
Printer/PC (9-pin)
Circuit Type
(EIA)
BB
BA
CD
AB
CC
CA
CB
Signal
Name
RD (RXD)
SD (TXD)
ER (DTR)
SG
DR (DSR)
RS (RTS)
CS (CTS)
Pin No.
2
3
4
5
6
7
8
PBX (9-pin)
Signal
Name
Pin No.
RD (RXD) 2
SD (TXD) 3
ER (DTR) 4
SG 5
DR (DSR) 6
RS (RTS) 7
CS (CTS) 8
Circuit Type
(EIA)
BB
BA
CD
AB
CC
CA
CB
184 Installation Manual
4.10 Connection of Peripherals
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