4
1 2 3 4
TX
– +
RX
– +
1
2
3
4
5
TX+
6
7
8
9
Pin # Signal Description
1
Transmit data +
2
Not connected
3
4
RX+
5
Not connected
6
TX-
Transmit data -
7
Not connected
8
9
RX-
Receive data -
Not connected
Receive data +
Not connected
DB9 RS-485
RX+
TX-
RX-
TX+
Fig. 6.1
Communication lines between the NetGuardian and the BSU II.
4-Wire Pin No. BSU II Comm. terminal
Wire Color
Port 8 Pin No.
Signal
1
TX – (Negative)
Orange/White
9
RX – (Negative)
2
TX + (Positive)
White/Orange
4
RX + (Positive)
3
RX – (Negative)
Blue/White
6
TX – (Negative)
4
RX + (Positive)
White/Blue
1
TX + (Positive)
Table 6.A
Data port 8 and 4-Wire pinout connections.
Wire for Power
6.3
GND
–48 VDC
Fig. 6.2
2-position barrier plug.
Use the following steps to wire the BSU II for power:
1. Connect a –48VDC power lead and a GND lead to the corresponding terminals of the 2-position barrier plug
— see Figure 6.2.
2. All barrier screws should be seated firmly but not over-tightened so as to nick the bare wire.
3. Push the plugs firmly back into their appropriate location on the bottom of the case.
4. Once the hardware connections are complete, power the unit(s) by applying -48VDC to the power lead.
Note:
Always observe electrostatic discharge (ESD) precautions.
Summary of Contents for Building Status Unit II
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