Altinex MX2436RM manual 7.2 RS-232 CONTROL OF THE SWITCHER, PIN No, PIN Designation, Switchers

SWITCHERS

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

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