Rs-422 Serial Interface Signals - Printronix L5000 Series Maintenance Manual

RS–422 Serial Interface Signals
The RS–422 serial interface signals are defined below.
Received Data (RxD) – Serial data stream from the host to the printer.
Transmitted Data (TxD) – Serial data stream from the printer to the host. Subject to
protocol selection.
Request To Send (RTS) – Control signal from the printer to request permission to
send data to the host. Subject to configuration.
Clear To Send (CTS) – Status signal to the printer indicating the host is ready to
receive data/status signals from the printer. When CTS is enabled, DSR and CTS
must both be asserted for the printer to transmit flow control characters to the host.
Data Set Ready (DSR) / Clock B – Status signal to the printer indicating the host is
in a ready condition. DSR is ignored unless CTS are enabled.
Data Terminal Ready (DTR) – Control signal from the host to the printer. When
enabled, the host will activate the data channel. Subject to configuration.
Clock Signal B – External timing for signals on data channel B.
F–18 Host I/O Interfaces