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2 Transmission Protocols
2.1
DTR - Ready/Busy
(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)
-
5 Clear to Send (CTS)
-
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.
The signal lines TXD (pin 2) and CTS (pin 5) are only necessary if the
Note:
Device Status Report is required (see picture "Connection for
Unidirectional Transfer Mode").
- Version 1 - Connection for Unidirectional Transfer Mode
25 pin
RS-232C
1
2
3
4
5
6
7
20
1)
Cables with bridges at printer side (4 to 5) for older PMs (lower than
PM-40A4) can also be used!
Appendix A System Interface Description
1)
(with internal Pull-up)
1)
(with internal Pull-up)
25 pin
1
2
3
4
5
or
6
7
20
Appendix A System Interface Description
- Version 2 - Connection full Duplex Transfer Mode
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.
25 pin
- Version 3 - PC Connection for full Duplex Transfer Mode
25 pin
Bridge between 7 and 8 on PC side means alternative RTS to CTS.
Note:
A-3
A-4
RS-232C
1
1
2
2
3
3
4
4
5
5
6
6
7
7
20
20
RS-232C
2
2
3
3
4
4
5
5
6
6
7
7
20
8
25 pin
9 pin
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