RS485/422 to UART , TTL

[dhouston]

I meant WizFi210.

I will look at incorporating support for their WIZ812MJ on the same shield as the WizFi210. It will be either/or as the WizFi210 is SMD and once installed you cannot "unplug" it and plug-in the WIZ812MJ.

[dhouston]

I misread the Wiz812MJ datasheet - it's SPI or parallel - not serial. Their only ethernet-to-serial TTL seems to be the Wiz105SR and it may not be possible to mount to a shield designed for the WizFi210.

[dhouston]

OK, the Wiz105SR just barely fits on a shield PCB with enough room left over to squeeze in a 2x6 header that can connect to the module via a ribbon cable. So, while I'm still waiting on answers to a couple of questions, I'm fairly sure I'll design a shield for the Wiz105SR and the WizFi210. Both are among the least expensive modules of these types.

[amgen]

Dave,
the WIFI210 data sheet says UART input, Shoud it be soldered to some kind of connector pins so it can be removed or replaced ? Mabye the different modules could fit the same connectors so a choice of boards could be used, like wifi, ethernet, bluetooth etc.


Don

[dhouston]

PICs and other µCs have UARTs - that's not the same as line drivers or transceivers. Fig. 9 in the WizFi210 manual makes it clear that it has 0-3V levels. The US dealer for WizNet checked the output of the Wiz105SR - it's 0-3V so it will need level conversion which can be as simple as a Schottky diode and pullup resistor (which will also work with a 3.3V supply). See this drawing which shows another (part of a) shield I'm working on that has six such level converters ...