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10.2.1: Power Source for Output Modules
The Nexus® 1262/1272 meter will not supply power to the Output modules. You must use an
external power source, such as the PSIO (12V) (or PB1). Refer to sections 5.3.11 and 5.3.12 to
determine power needed. RS485 communication is viable for up to 4000 feet (1219 meters).
You must also do the following:
1. Connect the A(+) and B(-) terminals on the meter to the A(+) and B(-) terminals of the male
RS485 port. Connect the shield to the shield (S) terminal. The (S) terminal on the meter is used
to reference the meter's port to the same potential as the source. It is not an earth ground
connection. You may also connect the shield to earth-ground at one point.
2. Put termination resistors at each end, connected to the A(+) and B(-) lines. RT is ~120 Ohms.
3. Connect a power source to the front of the module. (Refer to Section 5.3 for RT Explanation.)
Figure 10.3: The PSIO Power Source (Side View)
showing Male RS485 Side Port
Figure 10.4: Power flow from PSIO to Output Module
Electro Industries/GaugeTech
1.72"
Doc # E151701
SIDE LABEL
TOP LABEL
Figure 10.5: Labels for the
PSIO Power Source
(Labels are Red & White.)
10-4
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