Jim Jackson <> [2010-06-04 23:30:17]:
> The TS7260 option provides a diff pair for TX and a diff pair for RX on
> /dev/ttyAM1 (COM2). I have a device which has similar - the TX pair of one
> is connected to the RX pair of the other.
>
> You are probably saying that this is not proper rs485. Fine, sorry for
> using the wrong terminology.
Hi,
I think, that it's full duplex rs485, using two TX+RX+, TX-RX- pairs. And from
the docs it seems, that ts72xx supports full duplex operation:
"The COM2 Port supports RS-485 half duplex or full duplex operation."
and
"COM2 will default to RS-232 mode at reset (COM2 mode register = Hex 00). In
order to switch COM2 into Full duplex RS-485 mode, the COM2 Mode register at
0x22C0_0000 must be set to Hex 01. In this mode, the TX drivers are always
asserted".
> So rephrasing, is anybody using the rs485 option on the TS7260 in this
> mode?
I've just used it in half duplex mode and it was working. I've set
COM2 mode register to 0x04 (half duplex 9.6Kbaud), then called ioctl
TIOC_SBCS485 which enable automatic RX/TX control logic (necessary for
half-duplex operation, you don't need it).
> Can they verify that programmatically one can just treat it as a normal
> full duplex serial connection?
Yes, apart from rs485 setup bits I've used just my librs232 with it.
-- ynezz
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