Problems with sending data to serial

[d4n1el]

Hi!

This may be a stupid question. 

But i try to ask it, however...

I'm trying to communicate with a motor throu rs-232. 

The manual says that the commands should have the following form: (an example)

 SXWT <0H><0H><0H><32H> <88H><cr>

Where <0H><0H><0H><32H> is the data in a four byte long integer. <88H> is a checksum, that is easy to calculate.

My problem is how do I send the hex. data in a string(combined with the ascii-string in the beginning)?

[Coq_Rouge]

In such cases I prefer to start with a byte array. Before you send the data use the Byte array to string function.

[smercurio_fc]

Hard to say because it depends on whether the instrument wants that information as ASCII characters or as raw hex values.  It could be one of these:

 

or something else.  What does the manual say?

Message Edited by smercurio_fc on 06-14-2009 12:01 PM

[Coq_Rouge]

Also have in mind how the motor want to receive the integer. Labview uses Big Endian. If the motor want the integer in Little Endian you must use byte swapping