Using CitectSCADA > Communicating with I/O Devices > Setting Up Communications > Caller ID and commands
Caller ID and commands

Caller ID

A unique identifier which identifies a remote I/O Device when it dials back to the I/O Server. The caller ID can be any combination of alpha-numeric characters and/or the character '_' (underscore).

This ID will only be used if the I/O Device initiates the call to the I/O Server. If the modem initiates the call, you need to set the caller ID on the modem.

Note: If you are multi-dropping off a single modem, use your I/O Devices to issue the caller ID, not the modem. This is because using the modem to issue the ID will send the same ID no matter which I/O Device the call is relevant to, which makes it difficult to identify the I/O Device that triggered the call.

By using the I/O Device to issue the ID, the I/O Server will receive a unique caller ID for each I/O Device. However, not every I/O Devices are capable of issuing caller IDs. If you are multi-dropping, use I/O Devices that can issue caller IDs.



[Event Commands] On connect

Cicode to be executed once the modem is connected and the I/O Device has come online (that is, before any read or write requests are processed).

[Event Commands] On disconnect

Cicode to be executed before the connection to the I/O Device is terminated (and after read and write requests are processed).

Note: These values can also be set using the I/O Devices form in the Project Editor.

See Also