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SWITCHERS
8
output within the selected auto rotation time.
Audio inputs will also rotate, if AUDIO BREAK
AWAY mode was not previously selected
(Equalization will remain active).
6. To activate the AUTO SWITCH mode, press the
“AUTO SWITCH” button. The LED, which
represents the AUTO SWITCH mode, will turn
“ON”.
7. The “AUDIO VOLUME” mode will control the
audio stereo volume when the VOLUME UP or
DOWN button is pressed and released. The
AUDIO VOLUME UP or DOWN button is
between a maximum volume of +6dB and a
minimum volume of –6dB. From the minimum to
maximum volume there are fifteen steps. Each
step represents 0.8dB. After selecting the
volume, press and hold the UP and DOWN
buttons simultaneously.
8. To turn “OFF” the beeping sound, press and
hold the “BEEP ON/OFF” button. The LED,
which represents this button, should turn OFF.
To activate sound, press and hold the “BEEP
ON/OFF” button again.
9. To return the switcher to factory preset, press
the “RESET” button. After a brief delay, all LED’s
should blink ON and OFF. A beeper will sound
several times indicating that the switcher has
been reset.
7.2 RS-232 CONTROL OF THE SWITCHER
The MX2436RM Switcher offers remote control
capabilities through RS-232. RS-232 is the primary
communication standard used by control systems
and computers.
In fact, the MX2436RM offers more features using
RS-232 than are currently available from the front
panel of the unit.
The MX2436RM offers a terminal block using
solder-free, screw-down contacts, making it
extremely easy to connect the switcher to a control
system or a computer in the field.
Figure 1. RS-232 Terminal Block
PIN No. PIN Designation
1 +5V (not needed for
RS-232 connection)
2 GND (Ground)
3 RCV (Receive)
4 XMT (Transmit)
Table 4. Pin Designations.
The terminal block is labeled with the appropriate
contact designations: Transmit (XMT), Receive
(RCV), and Ground (GND). Always remember that
the Transmit pin from the control system or
computer must be connected to the Receive pin on
the control port of the switcher; do not connect
Transmit to Transmit or Receive to Receive.
Note: the contact labeled +5V is not used for
RS-232 connections. This contact provides DC
voltage to other equipment installed within close
proximity of the MX2436RM.
Typically, a control system or computer will offer
RS-232 connections on a 9-pin D connector.
The following are typical cable pin-out designations
for RS-232 connections on a 9-pin D connector.
Always verify that the pin-outs for your system are
correct to ensure the proper wiring.
IBM PIN No.
MX2436RM
Contact
3 RX
2 TX
7 GND
Connection of IBM-PC 25-pin D to the MX2436RM
Terminal Block