24
IM620-1
If there is continuity for each conductor pair, the wiring is continuous and it is likely (but not
guaranteed) that the terminations are correct throughout the trunk.
If there is no continuity for one or more conductor pairs, there may be a break in the trunk or the
TERMINATIONS
at one or more controllers may have been mixed up.
Table 9. Port B Voltages: AMP Type Connector
Port B (RS-485)
Signal
Terminal
Acceptable Voltage Reading
+
4
3.0 ± 0.3 Vdc
–
3
2.0 ± 0.3 Vdc
Ground
5
0.0 ± 0.2 Vdc
Table 10. Network Communications Field Wiring Terminals
Network Comm. Field Terminal
Controller
+
–
Ground
MAG Panel
T11-B+
T11-B–
T11-GND
OPM Panel
TB2-B+
TB2-B–
TB2-GND
Network Master Panel
TB3-B+
TB3-B–
TB3-GND
Figure 12. AMP Connector Terminal Configuration
5
3
1
2
4
6
COMMUNICATIONS
PORT A
PORT B
[FUSE: BUSSMAN MCR-1/4]
FUSE
1
3
2
4
5
3
1
2
4
6
a0114
Network MAG Controller Connection
In order for the NMP, OPM, or other level-1 controller in a network to connect and communicate with
level-2 controllers, the level-1 controller is connected first.
1.
Set the network address of the NMP, OPM, or other level-1 controller to 00 (level 1). See
“Addressing the Controllers” above for more information.
2.
Push the circuit breaker (CB1) button to power up the level-1 controller and verify that there is
power to the MCB by observing the LEDs.
3.
Check the voltages of port B directly on the AMP connector block. Refer to Figure 12 above.
Use a DC voltmeter to test for proper voltages. With the ground lead on the control panel chassis
(ground), check the voltage at the “+,” “–,” and “ground” terminals. Refer to Table 9 for the
correct voltage levels.
If no voltage or improper voltage levels are found, verify that the panel is energized.
4.
Plug the network communications AMP connector into port B.
