jdownarzap2 wrote:
I am still not out of the woods yet (can't make example "work" on my 2 PC's).
By the way, since I am controlling when writes/reads happen the examples should work on ONE COM port as well (of one machine).
First 1 write (let's say on master), then I read on slave...
What's wrong with this picture?
jd
How do you figure you are able to control when the writes and reads happen?
In the master example, the master writes the request, then reads the response.
In the slave example, the slave reads the request, then writes the response.
So the overall flow is
1. Master writes request.
2. Slave reads request
3. Slave writes the response
4. Master reads the response.
The master will read something on the Com port as soon as it is available, which would actually happen to be the request it had just written out. There is no way with the examples to have the two slave read/write operations interleaved with the two master write/read operations.
So you are trying to get this to work on 2 PC's?
What kind of errors are you getting? Are you using a null modem cable between the ports on the two PC's?
Going back to message 1, you said you were able to get RS-232 to work between the two PC's? But you can't get the Modbus examples to work? Are they running as two separate VI's or do you have them dependent on each other in some way. Perhaps you can post your VI's.
