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The Model 5390 server provides two utilities that enable hosts to send print requests to a remote

printer: aprint and rtelnet.

The aprint utility provides a unidirectional interface; it can send print jobs to the serial port.

Printers using aprint must be output only devices.

The reverse telnet daemon, rtelnet is a bidirectional interface for sending print jobs to serial

and serial PostScript-compatible printers.

The aprint and rtelnet utilities do not provide spooling capabilities, but you can use them as

transparent utilities for other printer spooling systems, e.g., lpd (BSD) or lp (System V). For more

details on these utilities, see Utilities starting on page C4-1.

Printer Cables

When using EIA ﬂow control (also known as hardware handshake, hardware ﬂow control, and RTS/

CTS ﬂow control), some printers may require a special cable. This cable should have the transmit

data and ground leads connected from the printer to the Model 5390 port as normal. The ﬂow control

signal generated by the printer (the location is printer-speciﬁc) should be connected to the CTS

signal on the Model 5390 server: this is pin 4 on a terminal cable and pin 5 on a modem cable. For

serial cable wiring diagrams, refer to Installing the Model 5390 Communication Server.

Conﬁguring Parameters for a Serial Printer

Consider the following port configuration parameters when attaching a printer to a serial port (see

Configuring Ports starting on page A3-1 for more details):

Set the type parameter to hardwired.

Set the mode parameter to slave.

Set the speed parameter to the speed of the printer. Do not use autobaud.

Set the data_bits, stop_bits, and parity parameters to match the requirements of the printer.

Set the allow_broadcast parameter to N.

For EIA ﬂow control, set the control_lines parameter to ﬂow_control and the

input_ﬂow_control and output_ﬂow_control parameters to eia.