Serial Interface Description; Serial Port (Rs232) - Western Telematic WTI NBB-20VS20 Series Hardware Manual

Appendix B.
Figure B.1: NBB 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.

Serial Interface Description

(Standard Pinout)
1
2
3
4
5
1 8
6
7
8
Apx-2
NBB
RTS
T
DTR
T
TXD
T
GND
GND
GND
RXD
R
DCD
R
CTS
R