Thanks for your response.

The device uses a Prolific USB to Serial driver on Comm Port 4.

I can type the following in the command window and get the correct data back from the device.

ot = CREATEOBJECT('mscommlib.mscomm')
ot.CommPort = 4
ot.Settings='115200,n,8,1'
ot.PortOpen = .T.
lqout = 0hA0A20001B700B7B0B3
ot.Output = lqout
lqin = ot.Input
ot.PortOpen = .F.
CREATE CURSOR test (testrec Q(100))
INSERT INTO test VALUES(lqin)

But when I run the same code in a PRG, the contents of the input buffer are cleared before being assigned to the local varuable.

I copied and ran the comm port tester (making a change for the different baud rate) but got no response from COMM PORT 4.

Thanks in advance for any insight.