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9.2: Installing Nexus External I/O Modules
I/O modules must use the Nexus 1250/1252 Meter's Port 3 or 4. Six feet of RS-485 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 RS-485 Side Port. Follow steps below and
see Figure 9.2 below. See section 9.3 for details on using multiple I/O modules.
Male Side Port
on Nexus I/O
Module
1250/1252
Port 3 or 4
* NOTE: Termination Resistors are only needed with runs typically more than 500 feet. The meter
has some level of termination internally and usually resistors are not needed.
Electro Industries/GaugeTech
LED's
R T
Nexus
Figure 9.2: Nexus Meter Connected to I/O Module
Doc # E107706 V1.25
R T *
(For runs typically longer than 500 feet)
9-3
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