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The markings on AS-MBKT-185 or AS-MBKT-085 seem to be inconsistant. What is the pinout of the Modbus Plus connectors?

Checking Wiring Continuity (Verifying pinout)
Open the tool, and remove the connector and cable. Locate pins 1, 2, and 3 of the connector as shown in Figure 96.

Using an ohmmeter set to a low resistance range, verify that direct continuity (zero ohms) exists between each white wire and pin 3. Verify direct continuity between each blue or black wire and pin 2. Verify direct continuity between each bare drain wire and pin 1.

If an improper connection has been made, and you have already installed one or both of the connectors at the two ends of the network cable, it is possible to read either 60 or 120 ohms resistance between a blue or black or white wire and its pin. Make sure you have direct continuity (zero ohms) between each wire and its proper pin.

Verify that no continuity (an open circuit) exists between each white wire and each drain wire. Verify that no continuity exists between each blue or black wire and each drain wire.


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