User's Manual

Company Confidential 25 Raveon Technologies
8 Serial Port Commands
8.1 Overview
Only trained radio technicians are allowed to modify the settings in this product.
The serial port the RF modem is used to send and receive data over the air, as
well as to configure the RF modem. In normal operation, the user sends data into
the TxD pin of the user port, and this data is transmitted over the air. Received
data from another RF modem is output to the user via the RxD pin of the user
port. This is the default operating condition of the RF modem. No special
characters, hardware control lines, or timing is required to operate the M7-UC
modem.
There is also a “Command Mode” used to program and configure the M7-UC. In
the Command Mode, the M7-UC modem accepts commands via the serial port
TxD pin. The commands can be used to change certain internal parameters of
the M7-UC modem as well as to read-out the current configuration and
diagnostic statistics.
8.2 Command Mode
The M7-UC modem may be put into a “Command Mode”, by entering a
sequence of three plus characters (+++). To keep the M7-UC modem from
unintentionally entering the Command Mode because of the +++ pattern
occurring in a stream of data entering the modem, there must be a pause in the
data stream before the +++ as well as a pause after the +++ is sent. If either
pause is missing, the modem will not enter the command mode.
Using serial communications software such as HypterTerminal, send the 3-
character command sequence “+++” while observing times of silence before [BT
(Silence Before Sequence) Command] and after [AT (Silence After Sequence)
Command] the command characters. The default BT and AT times are 500mS.
The default sequence for entering into AT Command Mode:
1. No characters sent for ½ a second.
2. Input three (3) plus characters (“+++”) within ½ of a second.
3. No characters sent for ½ a second.
When the M7-UC modem first enters the Command Mode, it sends the phrase
“M7-UC” out it serial port, and then an “OK” sequence. The “OK” sequence is a
sequence of 4 characters:
An “O”, “K”, <CR>, and <LF> characters (<CR> = ASCII 0D, <LF> = ASCII 0A)