November 28th, 2016, 12:21 AM
UART TX/RX pins for /dev/ttts8 on TS-7800
The TS-7800 Datasheet, UARTs section describes UART 8, /dev/ttts8 in tsuart7800.ko as having Tx on PC-104 pin C18, Rx on pin C19 and TxEn on pin C17
However, the wiring diagram TS-7800 DIO, LCD, PC/104 (page 8/8) shows CN11, the 40 pin connector as having pin C19 as a ground pin -- so it can't be the Tx pin.
Using a scope, it appears that the TS-7800 is actually transmitting on C17 which is supposed to be TxEn.
What is the correct Tx,Rx and TxEn connections for ttts8 and ttts9 (two of the TTL level uarts?)
November 29th, 2016, 04:16 PM
Correct pins for /dev/ttts8 and 9 for TS-7800
Experimentation shows that 40 pin PC-104 connector pins:
/dev/ttts8 Rx C18
/dev/ttts8 Tx C17
/dev/ttts8 TxEn C16
/dev/ttts9 Rx C15
/dev/ttts9 Tx C14
/dev/ttts9 TxEn C13
Note: TxEn seems to be an output from the TS-7800 that is constantly high (2.8V) while the Tx line is sending out bits.
(Please update the Wiki page for the TS-7800 to reflect this)
Last edited by ribo; November 29th, 2016 at 04:18 PM.
Reason: added request to update wiki page
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