Company Confidential
10
Raveon Technologies Corp.
Electrical Inputs and Outputs
3.6. LEDs
The status LED visually show the current status of the radio.
Status LED (TX)
This LED blinks red when the transmitter keys and is
putting out RF power. It blinks green upon the reception of data or RF carrier.
Power LED (PWR)
This LED does a short blink, once every two seconds,
indicating to the user that the power to the modem is ON and the modem is
working. When the modem is in the command mode, this LED will blink on
and off, once per second.
3.7. I/O Pinout
The I/O connector is a 20-pin header. Pin-out and connector type to match
MaxStream 9XTend.
I/O Pin Out
Pin
#
Function
I/O
Function
1
GND
-
Ground
2
Vcc
I
DC Input
3
Carr Det
O
CD Out. High for carrier. Low for no carrier.
4
TX On
O
Pin is High when module is transmitting. Low when off,
receiving, or sleeping.
5
Data In
(TXD)
I
Transmit data input.
6
Data Out
(RXD)
O
Receive data output.
7
Enable
I
Low to shutdown the module. High to enable it.
8
Sleep
i
CPU Sleep input
9
CTS
O
Clear to send output. Indicates state of internal buffers.
10
RTS
I
RTS input for serial flow control.
11
RSSI
0
Receiver signal strength indicator
12
I
13-
20
To be determined. Raveon may use these pins for
test functions and certain data-radio features.
3.8. Low Power Mode (LPM)
The
M8
modem, has the ability to be put into a low power mode (LPM). In
LPM the modem draws much less current from the DC input. In LPM, the
internal radio in the M8 is disabled, as well as certain current-consuming
hardware circuits. The ability of the
M8
to go into LPM is set with a
configuration bit, using the
ATSM 1
command.
ATSM 1
configures the M8 to
monitor the DTR input line, and enter the LPM mode whenever DTR is
negated. If the DTR signal is asserted, the M8 modem will operate normally.
The
ATSM 2
command forces the M8 modem into the low-power mode. In
the Low Power mode, the M8
’s radio circuits are off, but it will still respond to
