User guide

SATELLINE-3AS NMS / NMS Epic / NMS 869 / VHF
User Guide, Version 1.0
83
14.2.6
Profibus wiring
14.2.7
Fuse
A proper fuse must be connected in between the radio modem and the power supply, see
below:
Fuse
SATELLINE-3AS(d) NMS, NMS 869, VHF 1A slow
SATELLINE-3AS(d) NMS Epic 4 A slow
SATELLINE-3AS(d) VHF - 5W model 4A slow
14.2.8
Power supply
The allowed operating voltage is +9 … +30 V
DC
. (SATELLINE-3AS(d) NMS Epic +11.8 … +30
V
DC
). The radio modem must only be connected to a power supply with an adequate current
output (power rating minimum is 10W, with the Epic model 50W). The pins 15 and 14 of the D-
connector are connected to the positive power supply line. The pins 8 and 7 of the D-connector
are connected to negative power supply line (ground).
The DTR line of the radio modem (D-15 connector Pin1) can be used as an ON/STANDBY
switch, which helps to conserve battery power and prolong the operational time in battery-
powered applications. The radio modem is:
• ON if the voltage at the DTR pin is more than +2VDC.
• OFF in the Stand-by Mode if the voltage at the DTR pin is less than +0.6VDC.
Note: if the DTR pin is not connected, the radio modem is ON.
NOTE! There is a galvanic connection between signal ground (SGND, pin 7), ground (GND,
pin 8), outer conductor of antenna connector and modem casing.
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
A
B
GND
!