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PRODUCT NOTICE - November 12, 2013

THIS PRODUCT IS NOT RECOMMENDED FOR NEW APPLICATIONS:

  • OCM-101  DHC Series Modbus Option Module
         Click here for Datasheet: 800-160C PDF download

         Click here for Modbus User's Guide: 800-161C PDF download


REPLACEMENT PRODUCT:

  • OCM-102  DHC Series Modbus Option Module
         Click here for Datasheet: 800-191A PDF download

         Click here for Modbus User's Guide: 800-192A PDF download

Replacing OCM-101 with OCM-102 (refer to Datasheets for complete details)


MECHANICAL

The OCM-102 has the same package and mounting dimensions, allowing it to directly replace an OCM-101.


ELECTRICAL

The electrical connections to the OCM-102 are identical to the OCM-101.


FUNCTIONAL

As a direct replacement of the OCM-101, the OCM-102 will provide the same response as the OCM-101 to any of the Modbus functions.  For Modbus Functions $03 and $06, the OCM-102 response is much faster, providing near zero latency - see  Section V in the Modbus User's Guide for more details.

If the user defined Fucntion $41 is used with the OCM-101, it should be noted that the OCM-102 will experience an additional delay if a Function $03 request follows a Function $41 request.  The OCM-102 will provide an immediate exception response of $0B, and will continue to do so for subsequent Function $03 requests, until the delay period is over - see Section I in the Modbus User's Guide for more details.

The OCM-102 allows multiple registers to be requested with Function $03, where the OCM-101 is limited to requesting a single register only.

 

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