User's Manual

BT-GPRS-S
Installation Guide – Preliminary Wireless Data Modem
Rev A | Feb 2003, © BlueTree Wireless Data, Inc. Page 5 of 15
Power Connection
Table 3 Power connector
Pin
Annotation
Description
1
GND Ground
2
POS Power supply input 8 to 30 Vdc
3
IGN Ignition input
4
OUT #1 Digital output (horn alert)
How to install the power cable
Use a 12 volt DC power supply with the BT-GPRS-S. The power
cable connects to the modem with a Molex type connector. The
part number of the connector for the cable is 39-01-2040
(alternative part number 39-01-2045). The part number for the
pins for the cable connector is 39-00-0039.
The modem's power on/off is controlled by the ignition sense
line (white wire). When this line is pulled high (5 to 16 volts),
the modem will power on. The modem shuts down when the
ignition sense line is pulled low (less than 2 volts).
How to power-up the modem
The white ignition sense wire of the power harness must be
connected according to how the modem is to be powered on
and off. There options are:
1. The white ignition sense wire can be connected to the
vehicle's ignition such that the modem is powered on
only when the ignition key is switched to 'On'. The
modem is then ON, only when the engine is on.
2. Since the BT-GPRS-S has no on/off switch, the white
ignition sense wire of the power harness must be
connected according to how the modem is to be
powered on and off. The recommendation is that the
ignition sense wire be connected to a switch, rather than
connecting it directly to the red battery wire. It is also
recommended that the battery wire have a 3 amp fuse.
3. The white ignition sense wire can be connected to the
vehicle's ignition such that the modem is powered on
when the ignition is switched to 'Accessories'. The
modem can then be turned on, when the engine is off.
4. The white ignition sense wire can be connected to a
separate switch, mounted under the dashboard, that
allows the modem to be turned on or off, regardless of
the position of the ignition key.
The modem can also be configured, via an internal jumper pin,
so it can automatically turn ON when a DTR signal is applied in
Port 1. When DTR is low, the modem will turn OFF.