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I have to write an application in VB that communicates with an EXTECH MM570 DMM. I have never used the serial port with VB. They sent the protocol, but I'm not sure how to use it. This is what they told me "After sending out seven commands 10h, 02h, 00h, 00h, 00h, 10h, & 03h to meter, meter will send out 22 bytes data as shown in file." They also sent this: Program initiated procedures for COM port
1. Initiate COM port
2. Wait for 100ms
3. Set RTS=1
4. Wait for 100ms
3. Set RTS=0
4. Wait for 100ms
5. Set RTS=1
I have tried various methods using the MSComm control with no luck in receiving any data back from the meter. Has anyone ever done anything with this meter or something similar. I would greatly appreciate any help.
Thanks,
Scott K.
1. Initiate COM port
2. Wait for 100ms
3. Set RTS=1
4. Wait for 100ms
3. Set RTS=0
4. Wait for 100ms
5. Set RTS=1
I have tried various methods using the MSComm control with no luck in receiving any data back from the meter. Has anyone ever done anything with this meter or something similar. I would greatly appreciate any help.
Thanks,
Scott K.