Interfaces; Serial Interface Connector Layout - Olivetti PR4 SLIP Service Manual

1.7 INTERFACES

1.7.1 RS-232 Serial Interface Connector Layout
• RS232 Connector - PIN functions
Pin Signal
1 Frame GND
2 TXD
3 RXD
4 RTS
6 DSR
7 Signal GND
20 DTR
25 INIT
XYAA6338
Dir
—
OUT Transmitter data
IN Receiver data
OUT Fix to 'Space" level
IN Space(+12)
the host can receive data
Mark(-12)
the host cannot receive data
When DTR/DSR control is selected, the printer transmits data
after confirming this signal.
When XON/XOFF control is selected, the printer does not check
this signal.
If the signal remains Mark for more than 1msec the printer
performs a reset (only when selected from set-up).
—
OUT When DTR/DSR control is selected, this signal indicates whether
the printer is busy.
SPACE=OK/MARK=busy
When XON/XOFF control is selected, the signal indicates whether
the printer is connected and ready to receive data.
SPACE=OK /MARK=busy
The signal is always SPACE except during:
HW reset, Self test, Set-UP
IN The printer is reset when the signal remains Space for more
than 1msec (only when selected from set-up)
Service Manual 1-7