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2.8 TERMINAL CONNECTION
INSTALLATION
39
2.8.3 EIA (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 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 off-line.
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 EIA (RS-232C)
Pin
Number
Signal Name
Circuit Type
EIA CCITT