1
7
6
5
4
3
2
20
1
7
6
5
4
3
2
20
RS-232C
or
25 pin25 pin
1
7
6
5
4
3
2
20
1
7
6
5
4
3
2
20
RS-232C
25 pin
25 pin
7
6
5
4
3
2
8
7
6
5
4
3
2
20
RS-232C
25 pin 9 pin
Appendix A System Interface Description Appendix A System Interface Description
Cables with bridges at printer side (4 to 5) for older PMs (lower than
1)
PM-40A4) can also be used!
A-3 A-4
2 Transmission Protocols - Version 2 - Connection full Duplex Transfer Mode
2.1 DTR - Ready/Busy control the transmission of data from the host to prevent a buffer overflow.
(Supported RS-232C Protocols) - Full Duplex Local Connection
This protocol uses the following signal lines:
- Pin 1 Protective Ground (PG)
- 2 Transmit Data (TXD)
- 3 Receive Data (RXD) (with internal Pull-up)
1)
- 5 Clear to Send (CTS) (with internal Pull-up)
1)
- 7 Signal Ground (SG)
- 20 Data Terminal Ready (DTR)
The READY / BUSY DTR protocol uses the DATA TERMINAL READY line to
control the transmission of data from the host to prevent a buffer overflow.
Note: The signal lines TXD (pin 2) and CTS (pin 5) are only necessary if the
Device Status Report is required (see picture "Connection for - Version 3 - PC Connection for full Duplex Transfer Mode
Unidirectional Transfer Mode").
- Version 1 - Connection for Unidirectional Transfer Mode
The READY / BUSY DTR protocol uses the DATA TERMINAL READY line to
Note: Bridge between 7 and 8 on PC side means alternative RTS to CTS.
