I was wondering if anybody has knowledge of how the HHC-731 works. It is using a DB-25 connector, but has 30 conductors in it's hefty shielded cable. I am wondering if anybody knows what protocol it is speaking, is it using serial of some kind and then being converted to Harris's CAN protocol in the CA-0118399-001 adapter? I am not the greatest at electronics yet, and just bought a scope to probe around. I was thinking, a guy could probably decipher it's protocol, write up some code, toss in some ESP32 microcontrollers (in in the HHC-731, and one at the adapter cable), attach a battery to the thing, maybe 3d print a nice enclosure for it (or hot glue the SOB to the back, lol) and then basically create a Bluetooth handheld control unit/mic that way. My mic cable is cracking (kinda surprised they didn't choose a silicone jacket instead of the PVC garbage with all that heft) and so that has prompted me with ideas for solutions. Anyway, I am new to Harris, and if anybody can provide some input on this post, it would be appreciated. Maybe I just try to source a new better cable, but Bluetooth would make for a sweet low profile mobile setup. Personally, I wish the CU101239V1 style hand mic would work with the XG-100M as it is a far less unwieldly microphone with control features.
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HHC-731 and CA-0118399-001 adapter
- Thread starter kd9rqf
- Start date
noderaser
Member
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- Apr 21, 2023
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Do you have access to Tech-Link? The maintenance manual (MM-018323-001, Rev. B) has the pinouts on page 59. Shows CAN, RS-232, and RS-485 control lines running through, plus your typical audio stuff. Looks like it's basically something like a CH-721, split between two assemblies (the actual mic, and the CAN adapter box).
There are 6 active pairs of wires connecting the HHC-731. each follows RS-485 CAN-BUS protocol. 115200 B/s N81.
There are two wires that are connected to UART at both ends, RS-232 19200 B/s N81
two more wires, a difirential pair, RS485 protocol, 115200 B/s N81
Each pair has a ground/B- shield.
1 slightly larger wire powers the head, +5 volt with its B- ground.
All the other wires are grounded or not connected.
The HHC-731 and CH-721 are very similar, identical in functions.
There are two wires that are connected to UART at both ends, RS-232 19200 B/s N81
two more wires, a difirential pair, RS485 protocol, 115200 B/s N81
Each pair has a ground/B- shield.
1 slightly larger wire powers the head, +5 volt with its B- ground.
All the other wires are grounded or not connected.
The HHC-731 and CH-721 are very similar, identical in functions.
