Compuprint 9058 Programmer Manual - Manual (Page 143)

The Serial Interface
A78408098-003 C.14
Signal
Name Pin
Numb
er
Local
Connect.
Source
Remote
Connect.
Source
ISO/CC
ITT
Circuit RS-
232/C
Circuit Description
DCD 8 Data Set 109 CF Active HIGH level
signal. Indicates that
the host is
transmitting or the
data set is receiving
the Data Carrier
signal..
2 nd RTS 11 Printer 120 SCA Functionally
equivalent to the
DTR signal.
DTR 20 Printer Printer 108 CD Data Terminal
Ready. Normally
HIGH (ON).
Indicates that the
printer is ready to
initiate a connection.
The following table lists the RS-422/A serial interface signals::
ISO Circuit ID Signal Source Pin
Number
Description
T (A) Printer 13 Transmit.
MARK signal is present when printer is
not sending data.
T (B) 14 Transmit Return.
R (A) Host 16 Receive.
A MARK level is expected when sender is
in idle state.
R (B) 19 Receive Return.
G 7 Signal Ground.
Always connected to the 0 Volt of the
power supply.
SHIELD 1 Cable Shield.
Optionally connected to the frame ground
of the printer via a suitable jumper.