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61
MODULAR SMART SWITCH
A.8 RS-422 Cables
The pins and connector types used for RS-422 communication vary widely
between devices. Standard cables therefore do not exist. Connect the cable
as shown in Figure A-8. For systems using XON/XOFF handshaking, only
RXD +, RXD -, TXD +, and TXD - need to be connected.
Figure A-8. RS-422 Cable Pinouts.
Modular Smart Switch end
25-Pin socket connector
Communicating
device
9
10
11
12
15
16
13
25
9
HSOUT+
RXD-
RXD+
HSIN-
HSIN+
TXD-
TXD+
HSOUT-
+ve
-ve
+ve
-ve
+ve
-ve
+ve
-ve
Flow control
in
Transmitted
data out
Flow control
out
Received
data in
60
MODULAR SMART SWITCH
A.7 Connecting to DEC™ LN03 Laser Printer
The LN03 outputs its “printer ready” signal via pin 11, and so the wiring for
the serial data cable is slightly different from those shown earlier. Switch
bank 2, switch number 6, on the LN03 should be set to ON. This ensures that
the “printer ready” signal is HIGH when ready and LOW when not ready, and
not vice versa.
Figure A-7. DEC LN03 Serial Cable Pinning.
Modular Smart Switch end
25-Pin socket connector
DEC LN03 end
25-Pin plug connector
3
2
11
7
6
2
3
5
7
20