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B–9
Host I/O Interfaces
Idle Response Disable
One Char Enquiry Disable
NOTE: Only the factory default setting is shown above. Refer to the
“Configuring the Printer” chapter for additional options.
RS–422 Serial Interface
This interface is used with bit serial devices compatible with EIA RS–422B 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, 8 data bits, and one stop bit. 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 rear panel for
connection of a serial interface cable. Table B–5 lists the pin assignments of the
RS–422 interface connector.
Table B–5. RS–422 Serial Interface Pin Assignments
Pin Signal Direction
1 Chassis Ground Not applicable
25
19
Transmit Data + (TxD+)
Transmit Data – (TxD–)
From printer
From printer
17
15
Receive Data + (RxD+)
Receive Data – (RxD–)
To printer
To printer
7 Signal Ground Not applicable