Problems with RS232 write/read.

Question

I have a serial device, device responds to ASCII messages:
Reguest string:
!1100/
Responce from device:
!1100/#xx$xxxx/
x - ASCII characters.
I need to communicate with devise using RS232. Device has RS485 port (2-wire). RS232/RS485 converter data direction is controled by RTS line.
In my program I do something like this( single read for now): configure serial port, delay, asserted RTS line, transfer string, delay, unasserted RTS, read string, close port. I use VISA serial. Now I receive garbage. Where the problem might be ?

Answer 1

I tried other RS485 coverter ( with auto direction). My program works fine:
Request to device:
!1100/
Responce from device:
#00$xxxx/
Also using port monitor program I monitored data flow between original software (it comes with device) and device.
Reguest string:
!1100/
Responce from device:
!1100/#xx$xxxx/
x - ASCII characters.
So first is request echo and then responce from device.
Manipulating RTS line I only managed to receive request echo, but no responce.
Please see attached VIs: GIA10N - with no RTS control, and GIA10N_RTS - with RTS control ( I receive only request echo with it).
I am sure that my RS232/RS485 converter works standart way, because using serial comms software ( "Advanced serial port monitor") whitch dont know anything about my device I receive responce when I enable "RS485 interface mode". Then I get this:
Reguest string:
!1100/
Responce from device:
!1100/#xx$xxxx/
x - ASCII characters.
Attachments:
GIA10N.vi ‏61 KB