128
NetComm Wireless Light Industrial M2M Router Plus
www.netcommwireless.com
Appendix H: Serial port wiring
Figure 136 - DE9 Male connector (Pin side view)
The NWL-15 router has a serial interface and acts as the data communications equipment (DCE). The wiring tables below indicate
the DCE and DTE devices as well as the signal direction. Shielding cable can optionally be soldered to the chassis and connected
to ground.
DTE DEVICE (COMPUTER)
SIGNAL
DIRECTION
DCE DEVICE (NWL-15 ROUTER)
PIN
NAME
DESCRIPTION
DESCRIPTION
NAME PIN
1
DCD
Data carrier detect
Data carrier detect
DCD
1
2
RXD
Receive Data
Receive Data
RXD
2
3
TXD
Transmit Data
Transmit Data
TXD
3
4
DTR
Data Terminal Ready
Data Terminal Ready
DTR
4
5
GND
Ground
Ground
GND
5
6
DSR
Data Set Ready
Data Set Ready
DSR
6
7
RTS
Request to Send
Request to Send
RTS
7
8
CTS
Clear to Send
Clear to Send
CTS
8
9
RI
Ring Indicator
Ring Indicator
RI
9
-
FGND Shield (Soldered to D9 metal shield)
Shield (Soldered to D9 metal shield) FGND
-
Table 34 - RS-232 Wiring
RS-485 HALF DUPLEX WIRING
PIN
SIGNAL NAME
DESCRIPTION
1
—
A
Differential pair A
2
+
B
Differential pair B
5
GND
Ground
Table 35 - RS-485 Half Duplex Wiring
RS-485 (RS-422) FULL DUPLEX WIRING
PIN
SIGNAL NAME
DESCRIPTION
1
—
RXA
Receive (Differential pair A)
2
+
RXB
Receive (Differential pair B)
3
+
TXB
Transmit (Differential pair B)
4
—
TXA
Transmit (Differential pair A)
5
GND
Ground
Table 36 - RS-485 (RS-422) Full Duplex Wiring
Pin 9
Pin 6
Pin 5
Pin 1