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2.8 TERMINAL CONNECTION
Installation Manual 47
Standard IBM 25-Pin Connection
2.8.3 RS-232C Signals
Frame Ground (FG)
Connects an external ground to the unit frame, usually the earth 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.
Table 2-6 Pin Configuration of the RS-232C
Pin
Number
Signal Name
Circuit Type
RS-232C CCITT
1
2
FG
TXD
Frame Ground
Transmitted Data
AA
BA
101
103
3
4
RXD
RTS
Received Data
Request To Send
BB
CA
104
105
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
®
Circuit Type
(RS-232C)
AA
BA
BB
AB
CD
Circuit Type
(RS-232C)
AA
BA
BB
AB
CD
Signal
Name
FG
TXD
RXD
SG
DTR
Signal
Name
FG
TXD
RXD
SG
DTR
Pin No.
1
2
3
7
20
Pin No.
1
2
3
7
CBCTS5
CCDSR6
CFDCD8
20