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Slow serial communication

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I have to receive data via serial port from a device and I am using a FX5U with RS232 port. 

The only baud rate which seems to work is 2400, which is very low in my opinion. I have tested the serial comm on the device with a PC, same cable and it works flawlessly at 57600 baud rate.

The FX5U and device serial settings are similar.

Any ideea what can cause the low speed?

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What cable length do you have between the units ? 

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Cable is double shielded and 3m length. With the PC I got the right data at any baud rate, but with PLC I got corrupted data or no data at baud rates higher than 2400.

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Could you describe your setup a little more detailed ?

If you are using the FX5U-232-BD, how you connected your cable (pin to pin) ........

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