Put this under your [functions] stanza. Make xx whatever you want for the disconnect command.
* ilink cmds:
*
* 1 - Disconnect specified link
* 2 - Connect specified link -- monitor only
* 3 - Connect specified link -- tranceive
* 4 - Enter command mode on specified link
* 5 - System status
* 6 - Disconnect all links
* 7 - Last Node to Key Up
* 8 - Connect specified link -- local monitor only
* 9 - Send Text Message (9,<destnodeno or 0 (for all)>,Message Text, etc.
* 10 - Disconnect all RANGER links (except permalinks)
* 11 - Disconnect a previously permanently connected link
* 12 - Permanently connect specified link -- monitor only
* 13 - Permanently connect specified link -- tranceive
* 15 - Full system status (all nodes)
* 16 - Reconnect links disconnected with "disconnect all links"
* 17 - MDC test (for diag purposes)
* 18 - Permanently Connect specified link -- local monitor only