NETkom ES75 - Page 13

13
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Interface description
Use and operation
The power supply is implemented by the
“+” and the GND wire. To switch the
modem on, proceed as follows:
Either activate the DTR control line via •
the RS232 interface
Or connect IGT_IN to +. This connection •
has already been set up in the specified
plug-in power supply unit.
Purpose of the connectors/connections
Signal
name
PIN I/O Description Parameters
+ 1 I Positive supply voltage
connection
+8 V... +30 V
max. 33 V for
1 min
2 Free
PD_IN 3 I Reset input
high active
U
IH
> +5 V
(> 3.5 s)
U
IL
< +2 V
IGT_IN 4 I Ignition input
high active
U
IH
> +5 V
(> 200 ms)
U
IL
< +2 V
5 Free
GND 6 I Negative supply voltage
connection
Reference potential for
PD_IN and IGT_IN
0 V