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4 AT Commands, S-Registers, and Result Codes
51
Command: E
n
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: F
n
Echo Online Data Characters
Values:
n =
1
Default: 1
Description: F0 Enable online data character echo. (Not sup-
ported.)
F1 Disable online data character echo (included for
backward compatibility with some software).
Command: H
n
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: I
n
Information Request
Values:
n
= 0–5, 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
version, and country ID