RAD Data comm AMC-101 Dry Contact Circuit and Connector for Alarms, DC adapter Connection

AMC-101Installation & Operation Manual Chapter 3 - Operation

Grounding

Note

3.2 Cable Connections

DC adapter Connection.

In order to protect the AMC-1 from electrostatic discharge (ESD), use a DC adapter where the (-) DC pole is connected to the protective earth.

3.3 Dry Contact Circuit and Connector for Alarms

A dry circuit with a 9-pin D-type connector on the rear panel, has been added to the unit to signal minor and major alarms. The dry contact circuit is used to signal the following alarms:

Alarm type	Description
RED ALARM	Power Failure (DC voltage on board)
YELLOW ALARM	Signal Detect Failure (to any of the unit modules)
CONFIG ALARM	Improper Configuration (incompatible modules
	and/or data rates selected)

Three pins are dedicated for each alarm: Common (COM), OK and FAIL. The COM pin is the input for each alarm. The user can drive the COM pin with any signal (0 to 5v). If the signal is received OK, the COM pin is connected to its corresponding OK pin; If there is a failure, the COM pin is connected to its corresponding FAIL pin. See Table 3-4and Figure 3-3for the connector pin assignments.

Table 3-4 Connector Pin Assignment

Alarm Type		COM	OK		FAIL
RED	9		4	5
YELLOW	3		8	7
CONFIG	6		2	1

Figure 3-3 Connector Pin Assignment

Dry Contact Circuit and Connector for Alarms 3-3