In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

I'm using a serial (Rx, Tx) display very similar to the uOLED 128 GMD1 that Parallax now distributes. The Basic Stamp Demo code (and Connection diagram) for the uOLED 128 GMD1 states that 10K pull up resistors should be tied high on the Rx and Tx lines. 

[url=http://www.parallax.com/detail.asp?product_id=27925]http://www.parallax.com/detail.asp?product_id=27925[/url]

I would like to use my uLCD-320-PMD2 display with an SX-28 and it would be convient to use SX/B internal pull up coding versus actual external 10K resistors. 

[url=https://www.littlepcbsolutions.com/uLCD-320-PMD2.html]https://www.littlepcbsolutions.com/uLCD-320-PMD2.html[/url]

Do you think this would be ok? Is there any test I can do to check to see if they are needed or can use the internal pull up coding?

However, recently I saw on another posting that 4.7K resistors should be used on serial data lines like this. 

Comments?

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