Configuration
RFI-148 250W VHF Paging Transmitter User Manual
Page 14 of 43
Where:
AT
is the attention code. All AT commands must be prefixed with
AT
. This is case insensitive, so
At
,
aT
, or
at
can also be used.
xxx
is the actual command. The list of valid AT commands is given in Appendix D on page 33.
<[I1, I2, … In]>
is an optional section that allows the specification of an index. Indexes are
used to access one of an array of similar items. For example, the Crescendo radio has two serial
ports which can both have different configurations. The command
ATS52[0]=1004
set the point-
to-point destination on the main port, while the command
ATS52[1]=1004
will set the point-to-
point destination on the auxiliary port.
<=value>
is an optional section that is used to set the value of a configuration parameter. If this
section is omitted, then the value of the configuration parameter will be displayed.
<TERM>
is the terminator for the AT command. A terminator can consist of a carriage return
(ASCII value 13
Decimal
) or a carriage return followed by a line feed (ASCII value 10
Decimal
).
For each AT command that is issued a response is generated. The list of responses to AT commands is
shown in Table 1.
Response
Code
Response
Number
Description
OK
0
Returned whenever a command is entered that is executed correctly.
ERROR
4
Returned whenever a command is invalid or could not be executed.
BUSY
7
Returned when an attempt is made to enable the menu via
AT?
but the menu
system is already enabled on the other serial port.
Table 1: AT command response codes
3.6 Front Panel Interface
The front panel interface consists of 6 status LEDs and a transmit power gauge. The panel is illustrated in
Figure 4 and the function of each LED is described in Table 2.
LED
Colour
Description
Transmit On
Green
Turns on when the transmitter is on.
Fault
Red
Turns on when any fault is active.
Low Power
Red
Turns on when the sensed transmit power is lower than the
lower cut-off value as specified in the sensor parameters.
High VSWR
Red
Turns on when the isolator VSWR is higher than the higher
cut-off value as specified in the sensor parameters.
Serial/Ethernet
Green
Flashes when serial or Ethernet data is transmitted or
received.
Power
Green
Turns on/off at 1 Hz while power is supplied.
Power Gauge
Green/Red A bar graph displaying current transmit power.
Table 2: Front panel LED descriptions
