Appendix A System Interface Description
A-3
1.2
Transmission Protocols and Connection Diagrams
1.2.1
DTR - Ready/Busy
(Supported RS-232C Protocols) - Full Duplex Local Connection
This protocol uses the following signal lines:
S
Pin
1 Protective Ground (PG)
S
2 Transmit Data (TXD)
S
3 Receive Data (RXD)
S
5 Clear to Send (CTS)
S
7 Signal Ground (SG)
S
20 Data Terminal Ready (DTR)
Note:
The signal lines TXD (pin 2) and CTS (pin 5) are only necessary if the
Device Status Report is required.
The READY / BUSY DTR protocol uses the DATA TERMINAL READY
(DTR) line to control the transmission of data from the host to prevent a
buffer overflow.
Note:
Printer DTR may be connected to host DSR + CTS or only to host DSR
and a bridge between RTS and CTS.
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