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Chapter 4—AT Commands, S-Registers, Result Codes
Command: DS=y Dial Stored Telephone Number
Values: n = 03
Default: none
Description: Dial a number previously stored in directory number y
by the &Zy=x command.
Example: ATDS=3
Command: En Echo Command Mode Characters
Values: n = 0 or 1
Default: 1
Description: E0 Do not echo keyboard input to the terminal.
E1 Do echo keyboard input to the terminal.
Command: Fn Echo Online Data Characters
Values: n = 1
Default: 1
Description: F0 Enable online data character echo. (Not supported.)
F1 Disable online data character echo (included for back-
ward compatibility with some software).
Command: Hn Hook Control
Values: n = 0 or 1
Default: 0
Description: H0 Go on-hook (hang up).
H1 Go off-hook (make the phone line busy).
Command: In Information Request
Values: n = 05, 9, 11
Default: None
Description: I0 Display default speed and controller firmware version.
I1 Calculate and display ROM checksum (e.g., 12AB).
I2 Check ROM and verify the checksum, displaying OK or
ERROR.
I3 Display default speed and controller firmware version.
I4 Display firmware version for data pump (e.g., 94).
I5 Display the board ID: software version, hardware ver-
sion, and country ID
I9 Display the country code (e.g., NA Ver. 1).