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Hermes Operator Note Page 15 of 32
4.7 Software Version Information (AT I9)
This command tells the modem to output information about the software
version.
Example: ATI9=1<CR><LF> return software version
or ATI9<CR><LF>
Return: ‘an ASCII string detailing the ID and versions of the
internal processors’ <CR><LF>
An example of the return data is as follows:
Files:
Main micro:"QL3z10", Ver.:1.01.05, Date:31/10/2001
Slave micro:"Slave",Ver.:0.00.02, Date:12/11/20001
Flash Programmer:"karfl3", Ver.:1.00.03, Date:24/10/2001
Hermes®, © 2001, Wood & Douglas Ltd.
4.8 Command Mode Guard Time (AT S154)
To enable the transmission of the command sequence within a packet of
data, a guard time is placed around the command sequence. If the gap
between the characters in the command mode string is less than this guard
time, then the data string is assumed to be part of the data. This includes
the gap between the last received data byte and the first “+”. The command
is:
AT S154=nnn<CR><LF>
Where nnn =0 to 255 ms
Default: 10
Read: AT S154?<CR><LF> read the setting
Read Return: nnn<CR><LF>
Example: AT S154=10<CR><LF> set 10 msec time delay
4.9 Centre Radio Frequency (AT S155)
The channel change system for the Hermes is based around a centre
frequency. The Hermes is programmed with a factory set centre frequency
that is the centre of the RF switching band. The channel change is carried
out by programming a channel step size (typically 12.5kHz) and setting 00-99
above or 00-99 channels below the centre frequency. The centre frequency
can be changed and stored in EEPROM for moving the programmed
channels. A temporary change can also be made by storing a new centre
frequency in RAM. This is not restored if power is lost to the unit.