C – 7
Serial Interfacing (RS-422A)
To construct a cable for an RS-422A serial configuration you will need:
● DC-37P equivalent 37- pin plug, shell equivalent to DC-C1-J16
● Beldon (or equivalent) SHIELDED cable with twisted pair conductors. Must be
UL and CSA approved. The cable MUST be shielded.
● The printer has a 37-pin DC-37S receptacle.
Pin description
Pin no Signal Code Direction Connection Function
1 Shield SHILD — — Cable shield
3* Supervisory SSD From A-A' Signal to indicate
send data printer printer cannot
receive data in
21 Supervisory SSD From B-B' Ready/Busy
send data printer protocol
4 Send data SD From A-A' Data from printer
printer
22 Send data SD From B-B'
printer
6 Receive RD To printer A-A' Data to printer
data
24 Receive RD To printer B-B'
data
7* Request to RS From A-A' Signal to indicate
send printer printer cannot
receive data in
25 Request to RS From B-B' Ready/Busy
send printer protocol
9 Clear to CS+ To printer A-A' Reply signal to
RS. Printer send transmits data
after confirming
27 Clear to CS- To printer B-B' this signal as a
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