M91-t4-r6-zk1 Manual 'link' Guide

The "T4" and "R6" designations in the model name refer to its physical and functional configuration:

A: No. The manual specifies that "zk1" units require a 2.5mm jack programming cable, not the older 3.5mm version. An adapter (part number: CAB-ZK1) is required. M91-t4-r6-zk1 Manual

Recent firmware versions (v2.1 and above) include an embedded web server. The manual states the default IP is 192.168.1.200 with subnet mask 255.255.255.0 . Default credentials: admin Password: m91zk1_default (change this immediately per Section 6.4). The "T4" and "R6" designations in the model