C – 7Serial Interfacing (RS-422A)To construct a cable for an RS-422A serial configuration you will need:l DC-37P equivalent 37- pin plug, shell equivalent to DC-C1-J16l Beldon (or equivalent) SHIELDED cable with twisted pair conductors. Must beUL and CSA approved. The cable MUST be shielded.l The printer has a 37-pin DC-37S receptacle.Pin descriptionPin no Signal Code Direction Connection Function1 Shield SHILD — — Cable shield3* Supervisory SSD From A-A' Signal to indicatesend data printer printer cannotreceive data in21 Supervisory SSD From B-B' Ready/Busysend data printer protocol4 Send data SD From A-A' Data from printerprinter22 Send data SD From B-B'printer6 Receive RD To printer A-A' Data to printerdata24 Receive RD To printer B-B'data7* Request to RS From A-A' Signal to indicatesend printer printer cannotreceive data in25 Request to RS From B-B' Ready/Busysend printer protocol9 Clear to CS+ To printer A-A' Reply signal toRS. Printer send transmits dataafter confirming27 Clear to CS- To printer B-B' this signal as aSpace
