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no response for start network host message on a plc83 with latest version of SW

Other Parts Discussed in Thread: SYSBIOS, AFE031

This is PLC83 chip programmed with 7.7.1.6 firmware.on our custom board.

SystemInfoResponse (from device)
01 00 3E 00 2E 50 00 00 06 01 07 07 06 00 A2 6D 03 99 9F BA 9A D6 F5 1F 90 13 5E 46 3A 22 03 00 00 00 CE 4A 27 65 15 20 05 00 00 00 00 00 00 00 00 00 00 00 FF FF FF FF FF FF FF 09 FF FF FF FF 00 00
firmware version = 7. 7. 1. 6
device type -> G3
Device Mode -> Normal
HW Version -> Pre rev D
Data port = SCI-B
Diag port = SCI-B
Coherent modulation -> disabled
Tone Mask Request -> disabled
Long Address -> FF FF FF FF FF FF FF 09

I am sending a start network command and not getting any response for that message. Command sent:

[ 04/29/2016 15:37:31.669 PM ] 08 80 06 00 3F 14 59 CF 55 74

No response received,and after 5 mins, I get this response
[ 04/29/2016 15:42:03.042 PM ] 12-00-0A-00-04-19-00-00-00-00-8B-50-00-00

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Question:

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Under what conditions will the PLC 83 not respond to a start network command? What things need to be checked to solve this issue.

Kind Regards

Viswanath