User's Manual

60 MDS 9810 Installation and Operation Guide MDS 05-3301A01, Rev. C
8.4 Bench Testing Setup
Figure 30 shows a sample test setup that can be used to verify the basic
operation of MDS radios. This test can be performed with any number
of remote radios by using a power divider with the required number of
output connections.
14 -- Unused.
15 -- Do not connect—Factory test point.
16 -- Unused.
17 -- Digital Output Pin
Output value is 3 Vdc for set and 0 Vdc for clear. May be
activated via MDS Network Management Software.
18 IN/OUT Accessory Power
Unregulated input/output. Provides a source of power
for low-current accessories. The supply voltage may be
between 11.0 and 25 volts.
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 28 on
page 58 compare RSSI to dc voltage.
22 -- Unused.
23 IN Diagnostic Channel Enable
A ground on this pin causes the radio’s microcontroller
to open the DB-25 DATA INTERFACE connector for
diagnostics and control (in place of the more commonly
used RJ-11 DIAG(NOSTICS) connector).
24 IN Analog Input Pin
Input value can range between 0 and 5 volts DC.
Voltage must not exceed 5 Vdc or damage may result.
Analog input voltage may be monitored via MDS
Network Management software, where the 0-5 Vdc
range is translated to a value between 0 and 255 (hex
address 0xFF).
25 OUT Alarm Output
A logic low (less than 0.5 volts) on this pin indicates
normal operation. A logic high (greater than 4 volts)
indicates that an alarm condition is present. This pin can
be used as an alarm output, provided the internal series
resistance of 1 kΩ is considered.
Table 15. Data Interface Connector (DB-25) Pin
Pin
Number
Input/
Output Pin Description