Printronix L5520 - Manual (Page 222)

Appendix C Host I/O Interfaces
222
RS-422 Serial 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 9 lists the pin assignments of the RS-422 interface
connector.
Table 9
Pin Signal Direction
1 Chassis Ground Not applicable
2
14 Transmit Data A (TxDA)
Transmit Data B (TxDB) From printer
From printer
3
16 Receive Data A (RxDA)
Receive Data B (RxDB) To printer
To printer
4
19 Request To Send A (RTSA)
Request To Send B (RTSB) From printer
From printer
5
13 Clear To Send A (CTSA)
Clear To Send B (CTSB) To printer
To printer
6
22 Data Set Ready (DSR) / Clock A
Clock B To printer
To printer
7 Signal Ground Not applicable
20
23 Data Terminal Ready A (DTRA)
Data Terminal Ready B (DTRB) From printer
From printer