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Why can I only use the XBTZ9780 cable -COM1 RS485 - with the HMIG3U and not the HMIG5U with the Unitelway protocol?

Published date: 26 September 2018

Unitelway communication has higher requirement about timing sequence.
For this part(timing sequence), it is different in Vxworks & Windows platform.  and G3U is based on Vxworks, G5U is based on windows. 
That's why G3U can support but G5U cannot.

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