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Has anyone seen a commericially available "eavesdropping" Modbus Master
driver? What I'm trying to do is poll PLCs using MODBUS from a National Instruments Lookout system. No problem. The trick is, I want to have a backup Lookout system with all the same data. This is a MODBUS implementation via satellite. 6 second turnaround. The two PCs are miles apart and don't have any connection other than the Satellite. If I were going to do it custom, I'd write an "eavesdropping" driver and stick it in a PC between the backup Lookout and the satellite system. It would listen to the polls from the actual master over the MODBUS system, as well as the replies, and build a database from which to answer polls from the backup PC. Of course, I'd rather buy something that can be easily maintained than write something custom. Ideas?
George G. Robertson, P.E.
Manager of Engineering
Saulsbury E & C
(915) 498-6080 ext 232
[email protected]
driver? What I'm trying to do is poll PLCs using MODBUS from a National Instruments Lookout system. No problem. The trick is, I want to have a backup Lookout system with all the same data. This is a MODBUS implementation via satellite. 6 second turnaround. The two PCs are miles apart and don't have any connection other than the Satellite. If I were going to do it custom, I'd write an "eavesdropping" driver and stick it in a PC between the backup Lookout and the satellite system. It would listen to the polls from the actual master over the MODBUS system, as well as the replies, and build a database from which to answer polls from the backup PC. Of course, I'd rather buy something that can be easily maintained than write something custom. Ideas?
George G. Robertson, P.E.
Manager of Engineering
Saulsbury E & C
(915) 498-6080 ext 232
[email protected]