Rs-422 Serial Interface; Rs-422 Interface Connector Pin Assignments - Printronix L5000 Series Maintenance Manual

RS–422 Serial Interface
This interface is used with bit serial devices compatible with EIA–RS–422A or
CCITT V.27 and V.11 standards. The interface circuit characteristics are compatible
with the Electronic Industry Association Specification.
The printer is configured as Data Terminal Equipment (DTE).
The serial data transfer baud rate is selectable from the control panel. The input
format consists of a single start bit, 7 or 8 data bits, and one or two stop bits. The
operator can set the number of data bits from the control panel. The data bits are
interpreted with the least significant bit first. The operator can also set parity
checking via the control panel. The printer interface uses a first–in/first–out buffer
with the size selectable from the control panel. The asynchronous interface accepts
data as it is provided by the host computer.
The maximum cable length from the host computer to the printer is 400 feet.
RS–422 Interface Connector Pin Assignments
The printer provides a 25–pin DB–25S connector on the right side panel for
connection of a serial interface cable. This connector is also used for the RS–232
serial interface. Selection of the desired interface is determined by the position of the
RS232/422 switch located on the right, rear side panel of the printer.
Table F–4 lists the pin assignments of the RS–422 interface connector.
F–16 Host I/O Interfaces