05-4847A01-GB, Rev. B
MDS SD Series Setup Guide
4
To use the graph, simply enter the frequency you wish to use as
the center point of the graph, and enter the frequency range you
wish to cover. Select
Show Spectrum
to display the results.
The display creates a received signal strength indication (in dBm)
vs. frequency plot for signals near the center frequency (see
Fig-
ure 10
).
Invisible place holder
Figure 10. Spectrum Analyzer/Graph
(Portion of Display)
4 COM1/COM2 REFERENCE
The COM1/COM2
connectors (
Table 2
) are typically used to con-
nect an external DTE telemetry device to the radio, supporting
the RS-232 or RS-485 (balanced) format, depending on how the
radio is configured. The radio supports data rates of 300, 1200,
2400, 4800, 9600, 19200, 38400, 57600, and 115200 bps (asyn-
chronous data only) on these connectors.
These connectors mate with a standard DB-9 plug available from
many electronics parts distributors.
Figure 11
. COM1/COM2 Connector
(DB-9F)
As viewed from outside the
radio
4.1 Pin Descriptions—RS-232 Mode
COM1/COM2 Pin Descriptions—RS-232
Table 2
provides pin
descriptions for the connector when operating in RS-232 mode.
For RS-422/485, refer to the
Technical Manual
.
5 REGULATORY AND PRODUCT IN-
FORMATION
RF Exposure Notice
Concentrated energy from a directional antenna may
pose a health hazard to humans. Do not allow people
to come closer to the antenna than the distances
listed in the table below when the transmitter is oper-
ating. More information on RF exposure can be found
online at the following website:
www.fcc.gov/oet/info/documents/bulletins
.
Antenna Gain vs. Minimum RF Safety Distance
Antenna Gain
Safety
Distance
0–5 dBi
5–10 dBi
10–16.5 dBi
SD4
0.79 meter
1.41 meters
3.05 meters
SD9
0.46 meter
.82 meters
1.74 meters
SD1
For SD1, maintain an RF safety distance of 1.80
meters for a 7 dBd (9.15 dBi) antenna. Use of higher
gain antennas means increasing the distance
accordingly.
SD2
For SD2, maintain an RF safety distance of 1.50
meters for a 7 dBd (9.15 dBi) antenna. Use of higher
gain antennas means increasing the distance
accordingly.
other
models:
Consult factory prior to operation.
Table 2: COM1/COM2 Pin Descriptions—RS-232
Pin
In/
Out
Pin Description
1
OUT
DCD (Data Carrier Detect/Link)
—A low on this
pin indicates signal received.
2
OUT
RXD (Received Data)
—This pin supplies received
data to the connected device.
3
IN
TXD (Transmitted Data)
—This pin accepts TX
data from the connected device.
4
IN
Sleep Mode Input
—Grounding this pin turns off
most circuits in a remote radio. This allows for
greatly reduced power consumption, yet preserves
the radio’s ability to be quickly brought on line.
5
--
Signal Ground—
This pin connects to ground
(negative supply potential) on chassis.
6
OUT
Alarm Output (DSR)—
An RS-232 high/space
(+5.0 Vdc) on this pin indicates an alarm condition.
An RS-232 low/mark (–5.0 Vdc) indicates normal
operation. This pin may be used as an alarm
output.
7
IN
Reserved.
8
OUT
Reserved.
9
--
User I/O for special applications; not normally
used.
NOTE:
The radio is hard-wired as a DCE device.
