Apx-2
Appendix B.
Serial Interface Description
1
8
1
2
3
4
5
6
7
8
RTS
DTR
TXD
RXD
DCD
CTS
GND
GND
R
R
R
T
T
T
GND
NPS
(Standard Pinout)
Figure B.1: NPS Series RS232 SetUpPort Interface (RJ45 - Standard Pinout)
B.1. Serial Port (RS232)
DCD and DTR hardware lines function as follows:
1.
When connected:
a) If either port is set for Modem Mode, the DTR output at either port reflects the
DCD input at the other end.
b) If
neither
port is set for Modem Mode, DTR output is held high (active).
2.
When not connected:
a) If the port is set for Modem Mode, upon disconnect DTR output is pulsed for
0.5 seconds and then held high.
b) If the port is
not
set for Modem Mode, DTR output is controlled by the DTR
Output option (Serial Port Parameters Menu.) Upon disconnect, Option 23
allows DTR output to be held low, held high, or pulsed for 0.5 seconds and
then held high.
