User Manual

18 CompactRF
TM
Operating Manual: Chapter4 Configuration
The units should now be communicating. Remember, the parameters defined
by Factory Settings 1 and 2 will likely not be the most ideal for your
application, but will quickly allow you to test the units. A complete summary
of the settings defined by all four factory settings can be found in Appendix
C. Factory Default Settings.
Settings are not immediately stored in non-volatile memory when using AT
Commands, therefore, the command &W is issued to store the current
configuration into non-volatile memory. Settings are retained even after
powering down. All user selectable parameters for the CompactRF
TM
are
described in detail in Section 4.4: Configuration Settings.
Checking the Link
To check if the units are communicating, observe the LED indicators on the
development board. If the link is good, up to three RSSI LED’s on the
Master and Slave modems should be active; and if the link is absent (due to a
fault at one end or another, such as misconfiguration), the LED’s will be in
either “scanning mode” or inactive.
Characters typed at the Master terminal should appear at the Slave’s terminal,
and vice versa. Also, verify that the RX LED blinks as packets of data are
received at the Master modem. As data is sent from Slave to Master, the RX
indicator should blink on as correct packets of data are received. It is
recommended that if the CompactRF
TM
will be deployed in the field where
large distances separate the units, the modems should be configured and
tested in close proximity (e.g., in the same room) first to ensure a good link
can be established and settings are correct. This will facilitate
troubleshooting, should problems arise.
4.2 AT Commands
Several AT Commands are supported by the CompactRF
TM
. The commands
discussed in this section do not have a menu interface equivalent. More
commands and S-Register settings are discussed in Sections 4.3 and 4.4.
To make the command line more readable, you can insert as many spaces as
desired. The command line holds up to 16 characters, not including the AT
prefix. If you want to send more than one command line, wait for a
response before entering the AT prefix at the start of the next command line.
To re-execute the previous command, enter A/. The modem will execute
the previous command line.
When in Command Mode, the modem “autobauds”, meaning that it will
automatically adjust to the baud rate of the terminal. You may change the
terminal baud rate while in Command Mode without losing communication
with the modem.
For the AT command protocol, an escape sequence consists of three
consecutive escape codes preceded and followed by at least 1 second of
inactivity. Typically, the ‘+’ character is used as the escape code.
+++ preceded and followed by 1 second of inactivity