Hi,

We are developing a RS-232 driver for communication with an inverter. When testing our FPM, the RS.232 port on the SmartServer seems to be in a text mode, because it does the following without our intention:

• It echos the characters sent to it
• If a byte with value 10 (line feed) is sent from the FPM, we find that a byte with value 13 (carriage return) is added before

Does anyone know how to select "binary mode" instead (with no echo and no addition of carriage return)?

Sven

Hi again,

Here is some additional information about the problem I described before. Hope this makes it possible for someone to understand what is wrong and give us advice.

The SmartServer communicates via RS-232 with a PC, where a communication simulation program is running. This simulation program uses raw communication with the serial port and the setting there is 8 bits. However, the SmartServer seems to interpret it as 7 bits ASCII, despite that we have tried to set it to 8 bits.

Sven

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The VxWorks serial device can be switched to raw mode with:

  fd=rs232_open(9600);

  res=rs232_ioctl(fd, FIOSETOPTIONS, OPT_RAW);

This should disable echo and other options

FIOSETOPTIONS doen't work for rs232_ioctl

better use

...
res=ioctl(fd, FIOSETOPTIONS, OPT_RAW);
...

Thomas

Thank you

who have provided help here at the forum and Paul Robinson at Echelon support in the UK. You gave use the clues so we could solve the problem.

This is how we finally managed to get the SmartServer to communicate via RS-232 using 38400 bps, 1 start bit, 8 data bits, 1 parity bit, even parity and 1 stop bit:

fd=rs232_open( 38400 );
res=ioctl( fd, FIOSETOPTIONS, OPT_RAW );
res=ioctl( fd, SIO_HW_OPTS_SET, CLOCAL | CS8 | PARENB );

After this it seems necessary to reset the SmartServer to make some of the changes work.

Sven