User manual

MR-202/MR-204 Two- and Four-Channel Headset Stations Clear-Com Intercom Systems

Rev. B

7—Option Jumpers

Two option jumpers, JB1 and JB2, are provided. They should be configured

when the system is set up, but shouldn’t need to be changed during normal

operation.

Note:

The default position of the jumpers is in the OPEN (only one pin

connected) position. The function of each jumper is as follows:

JB1—Long Line

If a long cable run is unavoidable and approaches 1,000 ft. or more, set the

Long Line option jumper to the CLOSED (both pins connected) position. The

ability to set a sidetone null depends upon properly setting this jumper.

JB2—Latch Disable

Setting the Latch Disable jumper to the CLOSED (both pins connected)

position will disable the latching function of the Talk button. In this mode, the

Talk button must be held in continuously while the operator is talking.

8—Intercom Line Connection

The MR-202 contains a five-terminal, plug-on connector for intercom line

connection. The MR-204 contains a seven-terminal, plug-on connector for

intercom line connection. This connector is intended to be unplugged from the

circuit board when connecting the intercom line(s), and then plugged back on

when the wiring is completed. If less than the maximum number of intercom

lines are to be connected to the intercom connector, link unused intercom

inputs to a connected input with jumper wires. The connections for each pin

are visible on the circuit board when the connector is unplugged. The pinout

of this connector is as follows:

• Pin 1—(NC)

• Pin 2—Channel A Audio

• Pin 3—Channel B Audio

• Pin 4—Power (+30 VDC)

• Pin 5—Ground (Shield)

• Pin 6—Channel C Audio (MR-204 only)

• Pin 7—Channel D Audio (MR-204 only).