Extron electronic MLS 506MA, MLS 506SA, MLS 306 manual Setting the -6dB Jumpers

Installation, cont’d

Pin	RS-232 function	Description	Contact closure
1	–	Input 1	Input 1
2	Tx	Transmit data	–
3	Rx	Receive data	–
4	–	Input 2	Input 2
5	Gnd	Signal ground	–
6	–	Input 3	Input 3
7	–	Input 4	Input 4
8	–	Input 5	Input 5
9	–	Input 6	Input 6

5 1

96

DB9 Pin Locations

Female

•For a stand-alone MLS switcher, connect a cable from the host computer or a third party control system to this 9-pin D connector to set up and remotely control the switcher. Alternatively, connect a contact closure keypad to this connector for remote control of input selection.

•For an MLS switcher slaved to an MLC controller, connect a cable from the MLC’s MLS/Power port to the switcher’s MLC/IR connector (not to the 9-pinRS-232 port). Once the system has been cabled and set up via the Windows-based software, the MLC or a host computer communicat- ing through the MLC can be used to remotely control the switcher. Refer to chapter four of the MLC 206 User’s Manual and the MediaLink Control Program help file for details on configuring an MLC-MLS system.

CAUTION

If the switcher is connected to an MLC 206 controller via the MLC/IR port, do not connect an RS-232 device to the MLS’s 9-pin RS-232/Contact Closure port. Conflicts between RS-232 signals received from both ports could cause system disruptions.

When an MLC 206 is connected to the MLC/IR port, a contact closure device may be attached to the 9-pin connector.

Setting the -6dB Jumpers

In the MLS switchers, when audio signals are converted from an unbalanced input to a balanced output, an additional +6dB gain is applied to the output signal. To remove the +6dB gain from the balanced output or to apply a 6dB attenuation to unbalanced output, jumper headers have been applied to pins inside the switcher. The jumper headers can be removed if you would like to restore the +6dB gain. The -6dB attenuation can be set separately for the left and right audio channels by removing one of the jumper headers.

Input signal	Output signal	Gain/attenuation	Gain/attenuation
		with jumpers	without jumpers
Unbalanced	Unbalanced	-6dB	0dB
Unbalanced	Balanced	0dB	+6dB
Balanced	Unbalanced	-6dB	0dB
Balanced	Balanced	0dB	+6dB

CAUTION

Changes to settings inside the unit must be performed by authorized service personnel only.

Follow these steps to set the -6dB jumpers in any MediaLink Switcher.

1.Disconnect the AC power cord from the MLS to remove power from the unit.

To prevent electric shock, always unplug the MLS switcher from the AC power source before opening the enclosure.

2-12 MediaLink Switchers • Installation