26
MDS 1710A/C and MDS 2710A/C/D
MDS 05-3447A01, Rev. F
DUMP
This command displays all the programmed settings of the radio. The
HHT display is too small to list all the command settings at one time.
Therefore, this command is most useful if the command is issued from
a computer or full-screen terminal.
HREV
This command displays the transceiver’s hardware revision level if it
has been programmed at the factory.
INIT
The
INIT
command is used to re-initialize the radio’s operating parame-
ters to the factory defaults. This may be helpful when trying to resolve
configuration problems that may have resulted from the entry of one or
more improper command settings. Entry of this command allows you to
get back to a known working state. The following changes to the radio
are made when
INIT
is entered:
•
CTS
is set to 0
•
DATAKEY
is set to
ON
•
DEVICE
is set to
DCE
•
PTT
is set to 0
•
SCD
is set to 0
•
TOT
is set to 30 seconds and set to
ON
•
PWR
is set to +37 dBm (5 watts)
All other commands stay at their previously established settings.
INIT [2710]
This command sets the transceiver for operation
outside
the MDS model
P-20 chassis by setting the following parameters as shown.
ASENSE
ACTIVE HI
AMASK
FFFF FFFF
(assert alarm output on all alarms)
RXTOT
NONE
(receive time-out timer disabled)
This command can be used subsequent to using the
INIT 2720
command
to restore the standard transceiver defaults.
INIT [2720]
This command sets the transceiver for operation
inside
the model P-20
chassis by setting the following parameters as shown.
ASENSE
ACTIVE LO
AMASK
FFFF 0000
(trigger on major alarms)
RXTOT
20
(20 minute time-out timer)
MDS 05-3447A01, Rev. F
MDS 1710A/C and MDS 2710A/C/D
15
Invisible place holder
4.0 OPERATION
In-service operation of the transceiver is completely automatic. Once
the unit has been properly installed and configured, operator actions are
limited to observing the front panel LED status indicators for proper
operation.
If all parameters are correctly set, operation of the radio can be started
by following these steps:
1. Apply DC power to the transceiver.
2. Observe the LED status panel for the proper indications (
Table 5
).
3. If not done earlier, re
fi
ne the antenna heading of the station to maxi-
mize the received signal strength (RSSI) from the master station.
Use the
RSSI
command from an HHT connected to the radio’s
DIAG.
connector.—See
Section 5.0, TRANSCEIVER PROGRAMMING
.
This can also be done with a DC voltmeter as described in
Section 4.2, RSSI Measurement
.
19
OUT
9.9 Vdc Regulated Output.
Provides a source of
regulated voltage at 100 mA for low power accessories.
20
--
Do not connect—Reserved for future use.
21
OUT
RSSI—Received Signal Strength Indication.
A DC
voltmeter may be connected to this pin to read the relative
strength of the incoming signal.
Figure 8
is a chart showing
RSSI vs. DC voltage.
22
--
Do not connect—Reserved for future use.
23
IN
Diagnostic Channel Enable.
A ground on this pin causes
the radio’s microcontroller to open the DB-25 DATA
INTERFACE for diagnostics and control instead of the
normal RJ-11 DIAG. connection.
24
--
Do not connect—Reserved for future use.
25
OUT
Alarm.
A logic low (less than 0.5 volts) on this pin indicates
normal operation. A logic high (greater than 4 volts)
indicates that some alarm condition is present. This pin
can be used as an alarm output, provided the internal
series resistance of 1 k
Ω
is considered.
Table 4. DATA INTERFACE Connector Pinouts
(Continued)
Pin
Number
Input/
Output
Pin Description
