Hi,

I used MSComm control to comunicate with an PLC with or without modem, to control proces in termal plant.
Help files for MSComm control are sufficent for use it.

Example: supose we have a form with 'comm'=MSComm object in it.

Initialization:
thisform.comm.settings="9600,N,8,1"
thisform.comm.commport=2 & COM2 with 9600baud ....
thisform.comm.portopen=.T. & try to open port
if !(thisform.comm.portopen)
=messagebox('Port not opened!',0,'Error')
endif
.... now comunicate with something on port with
thisform.comm.output="bla bla bla..."
lreturnedvalue=thisform.comm.input

More useful settings:

comm.inputlen=0 & read entire buffer when you use comm.input
comm.inbuffercount & number of chr received in buffer
comm.outbuffercount & -\\- in output buffer
comm.rthreshold & number of chr received for fire event comm.oncomm()
comm.commevent & numeric code of event who fired comm.oncomm()

For more help right-click on MSComm and choose Help..