Hello everybody. I need to send pulses with frequency of 1 Hz, with time at a high level 5us (microseconds) for about 30 minutes at pin 3 of the serial port (Tx). Already built the circuit RS232 to TTL conversion. And the program I have done the basic routine of sending signal through the serial port and already noticed its perfect functioning. My problem is I can not send a 0 to the output. In the writing pad VISASERIAL WRITE the value I place is represented in ASCII and can not send a zero logic level at the output. Already consulted the table and the NUL code that represents bits 0 not out. I tried to use the VI BREAK but it does not satisfy my project because it keeps the low level by only 500ms and a certain delay occurs.
In short, HOW TO SEND A BIT ZERO BY EXIT VISA SERIAL WRITE IN ASCII?? Wish my output becomes zero for a few seconds.
Thank you guys. Attached follows my program.