Printronix L5520 - Manual (Page 219)

RS-232 Serial Interface
219
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 printer to
the host. When enabled, the host activates the data channel.
Subject to configuration.