Appendix A System Interface Description
1.2Transmission Protocols and Connection Diagrams
1.2.1DTR - Ready/Busy
(Supported
This protocol uses the following signal lines:
S Pin | 1 Protective Ground (PG) |
S2 Transmit Data (TXD)
S3 Receive Data (RXD)
S5 Clear to Send (CTS)
S7 Signal Ground (SG)
S20 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.
