XYAA6338 Service Manual 1-7
1.7 INTERFACES
1.7.1 RS-232 Serial Interface Connector Layout
• RS232 Connector - PIN functions
Pin Signal Dir
1 Frame GND —
2 TXD OUT Transmitter data
3 RXD IN Receiver data
4 RTS OUT Fix to ‘Space” level
6 DSR 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).
7 Signal GND —
20 DTR 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
25 INIT IN The printer is reset when the signal remains Space for more
than 1msec (only when selected from set-up)
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