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RS-232C
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Appendix A System Interface Description Appendix A System Interface Description
A-5 A-6
Additional Information
After Power-ON DTR is activated and the printer is ready to receive data.
DTR is deactivated when the interface buffer has only space left only for 256
more characters. Further incoming data will be stored until the interface buffer
is full. All data sent in addition will get lost.
DTR is activated again if there is a free interface buffer space of 512 characters.
DTR is immediately deactivated, if local mode is entered.
It is activated again, if local mode is left and a minimum of 512 bytes interface
buffer is available.
2.2 XON / XOFF
This protocol requires the signal lines.
- Pin 1 Protective Ground (PG) - Pin 5 Clear to Send (CTS)
- 2 Transmit Data (TXD) - 6 Data Set Ready (DSR)
- 3 Receive Data (RXD) - 7 Signal Ground (SG)
- 4 Request to Send (RTS) - 20 Data Terminal Ready
(DTR)
Standard Connection
For local connections RTS with CTS can be connected and likewise DTR
with DSR.
Note: Bridge between 4 and 5 means alternative RTS to CTS.
Cables with bridges at printer side (4 to 5 and 20 to 6) for older PMs
(lower than PM-40A4) can also be used!