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8
AL-1291 Point ID DGP
Installation Manual
DGP to point ID devices wiring restrictions
Connection to all point ID devices requires one + and one - terminal to provide power and data transmission.
Point ID devices provide for one or two bus terminals and can be connected in a single loop or in a multidrop
configuration (Figure 5). The bus loop does not need special termination.
Figure 5. Multidrop configuration
Point ID device
Table 2 shows the point ID bus load limits.
Table 2.
Load limits
Wire gauge (AWG)
22
20
18 or less
LEDs
The two LEDs (Figure 2 on page 5) on the DGP indicate polling status as follows:
RX. The RX LED flashes to indicate polling data is being received by the point ID DGP from the
Alliance control panel. If the RX LED does not flash, the DGP is not operational or the system bus
is faulty. Check the cabling.
TX. The TX LED flashes to indicate the point ID DGP is replying to polling from the Alliance control
panel. If the RX LED flashes, but the TX LED does not flash, the DGP is not programmed to be
polled in the control panel or the DGP is not addressed correctly.
-
+
-
Point ID device
Maximum number of point ID devices per point ID bus length
1000 feet (305 m)
32
32
32
+
- - + +
Point ID device
2500 feet (762 m)
20
32
32
+
+
_
_
AL-1291 Point ID DGP
5000 feet (1524 m)
16
20
32
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