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633 with TTL

zeroG

New member
Hi,

I am planning to connect the 633 (serial) with my MCU board. The signal from its serial interface is TTL not RS-232. I also don't want to add more cost to it (add TTL to RS232). Is there any jumper on the 633 that I can change from RS232 to TTL? Should I remove the SP3220 to by pass the TTL?

Thanks,
ZG
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CF Tech

Administrator
Do you already have the module, or are you about to order it? We can set it to Logic Levels here before you get it if you want.

Basically you can open jumpers JP2, JP6 & JP18, and close JP11 & JP12.
 

zeroG

New member
Thanks, very flexible. That's good. I like it.

I already had few samples here. I will ask for the predefine TTL level for the next order.

Thanks,
ZG
 

CF Tech

Administrator
If you will be ordering on an ongoing basis, please send a message to support(at}crystalfontz{dot)com (edit to '@' & '.') requesting a semi-custom part number. We will then make sure any modules ordered under that new semi-custom part number are configured correctly for you.
 
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