Appendix F: Serial Port Wiring - NetComm NTC-220 User Manual

Appendix F: Serial port wiring

The NTC-220 Series 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.
D T E D E V I C E ( C O M P U T E R )
P I N N A M E
1 DCD Data carrier detect
2 RXD Receive Data
3 TXD Transmit Data
4 DTR Data Terminal Ready
5 GND Ground
6 DSR Data Set Ready
7 RTS
8 CTS
9 RI
- FGND
P I N
1
2
5
P I N
1
2
3
4
5
NTC-220 – User Guide
UG01028 v1.2 March 2019
Figure 172 - DE9 Male connector (Pin side view)
D E S C R I P T I O N
Request to Send
Clear to Send
Ring Indicator
Shield (Soldered to
D9 metal shield)
Table 54 - RS-232 Wiring
R S - 4 8 5 H A L F D U P L E X W I R I N G
S I G N A L N A M E
— A
+ B
GND
Table 55 - RS-485 Half Duplex Wiring
R S - 4 8 5 ( R S - 4 2 2 ) F U L L D U P L E X W I R I N G
S I G N A L N A M E
— RXA
+ RXB
+ TXB
— TXA
GND
Table 56 - RS-485 (RS-422) Full Duplex Wiring
D C E D E V I C E ( N T C - 2 2 0 R O U T E R )
S I G N A L
D I R E C T I O N
D E S C R I P T I O N
Data carrier detect
Receive Data
Transmit Data
Data Terminal Ready
Ground
Data Set Ready
Request to Send
Clear to Send
Ring Indicator
Shield (Soldered to
D9 metal shield)
D E S C R I P T I O N
Differential pair A
Differential pair B
Ground
D E S C R I P T I O N
Receive (Differential pair A)
Receive (Differential pair B)
Transmit (Differential pair B)
Transmit (Differential pair A)
Ground
N A M E P I N
DCD 1
RXD 2
TXD 3
DTR 4
GND 5
DSR 6
RTS 7
CTS 8
RI 9
FGND -
180 of 193
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