User's Manual

40 MDS TransNET I/O Guide MDS 05-2708A01, Rev. A

9.3 dBm-Watts-Volts Conversion Chart

Table 12 is provided as a convenience for determining the equivalent voltage

or wattage of an RF power expressed in dBm.

6 OUT Alarm Output

A logic low (less than 0.5 volts) on this in 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

is considered.

DSR—Data Set Ready

Provides a +6 Vdc DSR signal through a 2.5 kΩ resistor.

7IN

RTS—Request-to-Send Input

Signal Ground

Connects to ground (negative supply potential) at the

radio’s PC board.

8 OUT CTS—Clear-to-Send Output

Goes “high” after the programmed CTS delay time has

elapsed (DCE), or keys an attached radio when RF data

arrives (CTS KEY).

DCD—Data Carrier Detect

A “high” indicates hopping synchronization.

9 -- Unused.

Table 11. Data interface connector (DB-9) pin descriptions(Continued)

Number

Input/

Output

Pin Description