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WI-MOD-9-D
Radio Modem
User Manual v1.9
WI-MOD-9-D
Manual
v 1.9
Page
40
“Pulse Low on Disconnect” - the DCD signal will be normally on but will switch off
momentarily (for 0.1 sec) when the link is reset.
Advanced Settings
These settings may be adjusted if the host device is using AT commands - refer to Appendix A
for an explanation of the different parameters.
S Registers
These are parameter registers settable by AT commands. They do not normally need to be
changed. Refer to Appendix A for an explanation of these parameters.
4.5
Hayes Commands
The WI-MOD-9-D unit may be configured by a host device using Hayes AT commands.
Configuration may be done “off-line” by a user (with a PC terminal as the host device) or it can
be done automatically “on-line” by a host device such as PLC or SCADA. The AT commands
are ASCII messages designed for use with conventional telephone modems.
Before a WI-MOD-9-D unit will accept Hayes commands, it must be in “command” mode. A
host device may force the unit to command mode by sending a sequence of three “escape”
characters - “+++”. The default escape character is “+”, however this may be changed as it is
one of the configuration parameters. There must be a 1 second break of data before and after the
escape sequence. The WI-MOD-9-D can be configured to start up in command mode (or
alternately in operating mode). It would be normal for the modem to start up in command mode
when used in single-connect controlled mode.
Once in configuration mode, the WI-MOD-9-D unit will accept a string of Hayes commands,
and the configuration changes made. The changes will not however be stored in permanent
memory (EEPROM) unless the Hayes command for recording the configuration (AT&W) is sent.
When the configuration changes are made, the module must be put back into its operating mode
by using the “online” Hayes command,
ATO
Commands are entered in the format ATxy, where x selects the parameter, and y the value of
the parameter. For example, ATB2 sets the radio data rate to 115200 baud. B selects the radio
rate parameter and 2 is the value corresponding to 115200 baud.
Summary
Enter command mode
<1sec break> + + + <1 sec break>
Response from WI-MOD-9-D
OK
Enter configuration commands
ATxy
Response from WI-MOD-9-D
OK
Save configuration
AT&W
Exit command mode
ATO