Hi hkjung,
Back in Sept. 2013 this question was ask by javakys, and never got a replay.
For months our products have had NO use for hardware flow control ie RTS/CTR, and systems is running fine with
WIZ107SR TTL.
In our current & new design there is a NEED to implement flow control, and as it turns out the [color=#0000FF]RTS[/color] pin on the
WIZ107SR TTL is held permanently LOW, except when you momentarily drive the nRESET pin, will the [color=#0000FF]RTS[/color] pin toggle
to HIGH for 440ms.
No toggling on the [color=#0000FF]RTS[/color] pin when there is incoming data from E2U interface?
As you are aware, WIZ107SR will only pass data from E2U only when [color=#0000FF]CTS[/color] pin is held low.
As you are aware, WIZ107SR will never signal on the [color=#0000FF]RTS [/color]pin that E2U data is in buffer ready for UART interface.
Is this how WIZNET has implemented flow control on the WIZ107SR?
1. That ONLY [color=#0000FF]CTS[/color] pin is what the module monitors?
2. That when WIZ107SR is turned ON, [color=#0000FF]RTS [/color]pin is always held LOW to indicate E2U data ready?
We had carried extensive test on these modules and all 20+ units exhibit above characteristics.
Module WIZ107SR,
PCB release 1.1,
Firmware 2.20.
Cheers,
Hanspeter.