User Manual

Appendix C Hayes AT Command Reference
RFI-9256 Radio Modem User Manual Page 77 of 96
Table 24: ATQ Quiet commands
C.1.8 “ATV” Verbal Response Codes
Response codes can be either verbal (English words), or numeric. The options for selecting response codes is
shown in Table 25.
Command Description
ATV0
Numeric response codes are generated.
ATV1
Verbal (string based) response codes are generated.
Table 25: ATV Verbal response codes commands
See the section S-Register and %-Register Commands on page 8 for a full list of response codes.
C.1.9 “ATW” Delayed Response
The RFI-9256 can often establish connections much faster than a conventional public switched telephone
network (PSTN) modem. In order to be compatible with PSTN modems the ATW command can be used to
delay the CONNECT response to link establishment by 1 second. The options are shown in Table 26.
Command Description
ATW0
Respond as soon as a connection is established.
ATW1
Allow for at least 1 second of delay before responding.
Table 26: ATW delayed response codes commands
C.1.10 “AT&C” Data Carrier Detect Control
Data Carrier Detect (DCD) is an RS-232 signal used to indicate to the DTE that a connection is established
to a remote radio. The AT&C command is used to tell the radio how it will control the DCD output as shown
in Table 27.
Command Description
AT&C0
DCD is always asserted.
AT&C1
DCD follows the online status of the radio. Online status is discussed in section 4.3.6.
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 27: AT&C data carrier detect control commands