User guide

SATELLINE-3AS NMS / NMS Epic / NMS 869 / VHF
User Guide, Version 1.0
82
14.2.4
RS-422 wiring
If the transmission lines are long the receiving end of the lines must be terminated using a
separate termination resistor (typical values range from 100 -120 depending on the
characteristic impedance of the transmission line).
14.2.5
RS-485 wiring
Both ends of the transmission line must be terminated by connecting a separate terminating
resistor between the positive and negative signal wire. Typical values range from 100 – 120
depending on the characteristic impedance of the line.
A'
2
RADIO MODEM
1
14,15
7, 8
DTR
+Vb
GND
+Vb
GND
B'
3
A
4
B
5
RD positive
RD negative
TD positive
TD negative
Termination
resistor
Fuse
3AS: 630 mA slow
3AS Epic: 4 A slow
A'
2
RADIO MODEM
1
14,15
7, 8
DTR
+Vb
GND
+Vb
GND
B'
3
A
4
B
5
Data positive
Data negative
Termination
resistor
Fuse
3AS: 630 mA slow
3AS Epic: 4 A slow