59
MODULAR SMART SWITCH A.6 Connecting to NEC Spinwriter
The NEC Spinwriter®series of printers also provide a DB25 socket connector
for serial data. However, their “printer ready” flow-control signal is output on
pin 19 (unlike most printers, which output this signal on pin 20). Suitable
wiring is as shown in Figure A-6.
Figure A-6. NEC SpinWriter Serial Cable.
Modular Smart Switch end
25-Pin socket connector
NEC Spin Writer end
25-pin plug connector
3
2
19
7
5
6
8
2
3
3
7
20
58
MODULAR SMART SWITCH
A.5 Connecting to Plotters
A wide range of different pin configurations are used on plotter serial ports.
The following cable can be used for most plotters including those
manufactured by Hewlett Packard and Roland. Notable exceptions are
Calcomp plotters, which need a “straight-through” cable shown in Figure
A-4. If you have a cable that currently works between your PC and plotter,
then this can be used between the Modular Smart Switch and your plotter
with the addition of an adapter.
Figure A-5. Plotter Cable Adapters.
2
3
5
6
20
7
Modular Smart Switch end
25-Pin socket connector
TXD
RXD
CTS
DTR
GND
3
2
20
5
6
7
Plotter end
25-pin plug connector
NEC Spinwriter end 25-pin plug connector