End-to-End I/O Telemetry over Cellular Networks

End-to-End I/O Telemetry is used when a small amount of I/O needs to be replicated at another site. Although PLC’s or RTU’s can be used for this, it is usually more cost-effective to use I/O Telemetry technology which is designed specifically to handle a small amount of I/O.

Because wireless End-to-End I/O telemetry has traditionally relied on licensed or unlicensed radio technology it’s range has been limited to line-of-sight. However, IP-based communications leveraging the extensive coverage of cellular networks removes this constraint.

The UNICON IP configured with the I/O cellular telemetry option is an example of such a technology. Using the UNICON IP with the End-to-End cellular telemetry option, one could have multiple telemetry links concurrently operating over the entire cellular network.

Conceivably, a network with extensive coverage could enable inputs/outputs on one side of the link to be replicated thousands of miles away on the other side of the link.

With the UNICON IP, each UNICON has the following I/O mapping in this mode: 4 DI, 4 DO, 4 AI & 4 AO. The End-to-End I/O mapping between two UNICON terminals is:

  • 4 DI to 4 DO
  • 4 DO to 4 DI
  • 4 AI to 4 AO
  • 4 AO to 4 AI

Digital inputs can be replicated as digital outputs on the other side of the link. The UNICON IP is designed to enable I/O telemetry over cellular networks by reducing data rates by transmitting change of state.

The diagram below shows how multiple UNICON End-to-End I/O Telemetry links from the same client, can concurrently operate on the same cellular network. All that’s required to specify an End-to-End link is to configure each terminal with the matching terminal’s IP address.

Cellular network connectivity