First of all thank you for all the kindness reply. However I still couldn't solve the problem. I think I must clearify something.

Actually I would like to use the Serin2 and Serout2 command to do the asynchronising on any of the hardware pin.

As I know the Hserout and Hserin only implemented on the certain hardware pins.


The command of the SerOut2:
SerOut2 ModemOut, ModemSpeed, ["ate0",13]

Where the
1. ModemOut = Pin to be used

2. ModemSpeed = A number from the calculation Of
[int(1000000/baudrate)-20]

3. ["ate0",13] = any string to send out to the pin


So I do not know the HSER setting will effect the SerOut2 and SerIn2 command or not.

Please help.