[ts-7000] On 7800 cannot use ttts4 or ttts5 (com3 header)

["eric.robishaw" <>]

Using com3 header, I can get ttts4 to RECEIVE data only, it will NOT transmit, 
ttts5 does nothing.

I've verified all my wiring, from end to end, so it's not a cabling issue.

ttts4:
2  ----- 2
3  ----- 3
5  ----- 5

ttts5:
7 ------- 7
8 ------- 8
5 ------- 5

(I've also tried reversing 2/3 and 7/8, to no avail.)


using minicom, I've tried multiple baud rates.
I've also tried setting the com rate via setserial 
again, no effect.
I've also tried simply to echo 'hello' >> /dev/ttts4, with no effect.

ttyS0 works fine on the COM1 header, but I need to leave it open.

Same effect booting from SD or from flash.

Thanks
Eric



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