Compuprint 9058 Programmer Manual - Manual (Page 142)

The Serial Interface
A78408098-003 C.13
Serial Interface Signals
The following table lists the RS-232/C serial interface signals:
Signal
Name Pin
Number
Local
Connect.
Source
Remote
Connect.
Source
ISO/CC
ITT
Circuit RS-
232/C
Circuit Description
FRAME
GROUND 1 - - 101 AA This printer is
shipped with pin 1
connected to the
frame ground
(protective ground).
TXD 2 Printer Printer 103 BA Transmitted Data
Signal (an output
from printer). A
MARK condition is
held during IDLE
communication
state. An
indeterminate state
is present when
printer is powered
off.
RXD 3 Host Data Set 104 BB Received data signal
(an input to printer)
RTS 4 Printer Printer 105 CA Request to Send
Signal (an output
from printer).Active
HIGH level signal. It
is HIGH until the
printer is powered
off, then an
indeterminate state
is present .
CTS 5 Data Set 106 CB Active HIGH level
signal indicates that
the host or data set
is ready to receive
data from the
printer..
DSR 6 Data Set 107 CC Active HIGH level
signal. Indicates
that the host or data
set is ready to be
connected to the
printer and is ready
for data transfer.