STI Engineering rfi-9256, Руководство пользователя

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Appendix C Hayes AT Command Reference
RFI-9256 Radio Modem User Manual Page 89 of 109
Command Description
AT&C0
DCD is always asserted.
AT&C1
DCD follows the online status of the radio. Online status is discussed in section 5.3.6.
AT&C2
DCD follows the DTR input of the remote radio when a connection is established, and is low
when there is no connection established.
Table 26: AT&C data carrier detect control commands
C.1.11
“AT&D” Data Terminal Ready Activity
Data Terminal Ready (DTR) is an RS-232 signal used to indicate to the radio whether the DTE is ready to
communicate. The
AT&D
command is used to tell the radio how it will react when the DTR signal changes.
The options are shown in Table 27.
Command Description
AT&D0
The radio ignores the DTR signal.
AT&D1
The radio enters local command mode whenever DTR is low.
AT&D2
The radio hangs up the current connection whenever DTR goes from high to low.
AT&D3
The radio hangs up and returns to the local command mode whenever DTR is low. The radio
with this configuration must be DTR asserted before dialling or answering otherwise an
immediate hang-up will occur.
Table 27: AT&D data terminal ready activity commands
C.1.12
“AT&F” Restore Factory Defaults
All configuration values in the RFI-9256 have factory default settings, outlined in Appendix D on page 105.
The
AT&F
command can be used to reset some or all of these settings to the factory default state.
Command Description
AT&F0
Restores the Hayes radio interface to the factory default settings.
AT&F1
Restores all radio settings to their factory default state.
Table 28: AT&F restore factory defaults commands
C.1.13
“AT&G” Exclusive Port Control
There are times when a DTE may require exclusive control of a radio. Since the RFI-9256 is a dual port
radio, this involves preventing any dial attempts from the other serial port. There are three options for
exclusive port control