7
3. Make sure that the power supply to the unit is off.
4. Connect a –48 VDC line to the –48V terminal and a battery ground to the GND terminal of the screw lug.
Seat the barrier screws firmly, but be careful not to nick the bare wire.
Note:
Observe polarity when connecting battery leads. If using the –48 VDC red/black cables supplied with the
unit, connect the black lead to battery GND and the red lead to –BATT. Standard gauge is 20 AWG, but may vary
between 18 to 24 AWG.
5. Push the plug firmly into its socket. Note that this connection is keyed and the plug must be properly aligned
within the socket.
6. Do not power the unit until all connections have been made.
7. With the NetGuardian fuse removed, turn on the supply voltage.
8. Connect the black common lead of a voltmeter to the GND terminal and the red lead to the –48V terminal.
The voltmeter should read between –43 and –53 VDC. If the reading is outside this range, check your power
supply.
9. The
PWR (power) LED
by the power feed will light GREEN.
10. Insert the fuse to power the NetGuardian. Front panel lights should flash GREEN and RED.
Dialup Connection
4.5
Fig. 4.4.
DB9 Modem port
The NetGuardian 216 connects to a standard phone line for reporting alarms to T/Mon. Connect the provided
DB9 cable to the back panel DB9 Modem port — see Figure 4.4. Pinouts for the Dialup port are shown in Figure
4.5.
1
2
3
4
5
6
7
8
9
Pin # Signal Description
1 NC Not connected
2 NC Not connected
3 NC Not connected
4 TIP
5 NC Not connected
6 NC Not connected
7 NC Not connected
8 NC Not connected
9 RING
TIP
RING
Fig. 4.5.
Pinouts for the DB9 Modem port
