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Browse Questions » STEP 7 (TIA Portal): How Towards transmit a Assign From characters Within a proper way? Serial Connection Point

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STEP 7 (TIA Portal): How Towards transmit a Assign From characters Within a proper way? Serial Connection Point

Hello everyone,
I faced with a task on transmit of characters set to serial interface device (e.g. command
POS?; 
).
For a better understanding what I mean, I collected all related info into single pic. Please see attachment.
Despite everything looks good at both patterns theoretically. I'm stuck after a few unsuccesful attempts to send a command  and to receive an answer. So I decided to post here my questions.
Yes, there might be a range of reasons interferring to normal communication (e.g. Baud rate and so on.)
The questions are actually:
how to transmit a character in a proper way?
How to transmit a set of characters in a proper way (e.g. command
POS?;
   )?
I'm interested in both variants LAD, SCL.
Msorich

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