Printronix L1024 - Manual (Page 114)

B–10 Host I/O Interfaces
RS–232 Serial Interface Signals
The RS–232 serial interface signals are defined below.
Receive Data (RxD) – Serial data stream to the printer.
Transmit Data (TxD) – Serial data stream from the printer for transmitting
status and control information to the host. Subject to protocol selection.
Request To Send (RTS) – Control signal from the printer. 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) – Status signal to the printer indicating the host is in a
ready condition. DSR is ignored unless CTS or CD are enabled.
Carrier Detect (CD) – Status signal to the printer. The ON condition is required
for the printer to receive data. Available as a configuration setup option. When
CD is enabled, the host must assert both DSR and CD for the printer to accept
data.
Data Terminal Ready (DTR) – Control signal from the host to the printer.
When enabled, the host will activate the data channel. Subject to configuration.