I've attached the most up-to-date version of the INCOM communication protocol description I have for this product.
In particular, this includes the Extended Status Code (3 0 1) reply (code 47) to retrieve whether the breaker is in ARMS mode (Arcflash Reduction Maintenance System) or not.
(http://pps2.com/images/smf/other_comm/2015-10-02_14-08-26.jpg)