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E154713
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11: Using the I/O Options
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
11.8.2: Installing Optional External I/O Modules
I/O modules must use the Nexus® 1500+ meter's Port 2. Six feet of RS485 cable
harness is supplied. Attach one end of the cable to the port (connectors may not be
supplied); insert the other end into the communication pins of the module's male
RS485 side port (see Figure 11.2). See Section 11.8.4.1 for details on using multiple
I/O modules.
Installing the External I/O Modules
1. Connect the (+) and (-) terminals on the Nexus® meter to the (+) and (-)
terminals of the male RS485 port.
2. Connect the shield to the shield (S) terminal. The (S) terminal on the Nexus®
meter is used to reference the Nexus® meter's port to the same potential as the
source. It is not an earth to ground connection. You must also connect the shield to
earth-ground at one point. Vous devez également connecter l'écran à la terre à un
endroit donné.
3. Put termination resistors at each end, connected to the (+) and (-) lines. RT is
~120 Ohms.
4. Connect a power source to the front of the module.
11.8.3: Power Source for External I/O Modules
The Nexus® 1500+ meter does not have internal power for the external I/O
modules. You must use a power supply, such as the EIG PSIO, to power any external
I/O modules.
Figure 11.4: PSIO Side View
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