INSTALLATION
42
Installation Manual
2.8.3
RS-232C Signals
Frame Ground (FG)
Connects an external ground to the unit frame, usually the ground pin of the AC power cord.
Transmitted Data (TXD)—output
Conveys signals from the unit to the terminal/printer. A "mark" condition is held unless data or
BREAK signals are being transmitted.
Received Data (RXD)—input
Conveys signals from the terminal/printer to the unit.
Request To Send (RTS)—output
This lead is held on whenever DSR is on.
Signal Ground (SG)
Connects to the DC ground of the unit for all interface signals.
Data Terminal Ready (DTR)—output
This signal line is turned on by the unit to indicate that it is RS-232C on-line. Circuit DTR ON
does not indicate that communication has been established with the terminal/printer. It is
switched off when the unit is RS-232C off-line.
6
DSR
Data Set Ready
CC
107
7
8
SG
DCD
Signal Ground
Data Carrier Detect
AB
CF
102
109
20
DTR
Data Terminal Ready
CD
108.2
Table 7 Pin Configuration of the RS-232C
Pin
Number
Signal Name
Circuit Type
RS-232C
CCITT
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