Specifications

ISU AT Command Reference Phase I AT Commands
Iridium Proprietary Version 2.45
20 June 2011 16
5 Phase I AT Commands
5.1 AT - ATtention Code
This is the prefix for all commands except A/ and +++. When entered on its own, the ISU will respond
OK.
5.2 A/ - Repeat Last Command
Repeat the last command issued to the ISU unless the power was interrupted or the unit is reset. A/ is not
followed by <CR>.
5.3 +++ - Escape Sequence
The escape sequence is used to transfer from in-call data mode to in-call command mode without
disconnecting from the remote modem. After a pause, the ISU will respond with OK. Register S2 can be
used to alter the escape character from +, the factory default, to any hexadecimal value in the range 0 to
255.
5.4 A - Answer (Initial implementation; revised in Phase III)
Answer immediately. This causes the ISU to answer the incoming data call.
5.5 Bn - Communication Standards
Select the communications standard to be used for data calls.
No action, compatibility only.
Any value for n accepted.
5.6 Cn - Carrier Control
Control carrier detection.
No action, compatibility only.
Only n=1 accepted.