4x4 Video/Stereo Audio
Vertical Interval Matrix Switcher
OMX-4X4
812 Kings Highway • Saugerties, NY 12477
A Division of Tower Products, Inc.
OMX-4X4 SWITCHER SERIAL PROTOCOL SPECIFICATIONS
2.0
GENERAL OVERVIEW
Note that on power up the unit has all outputs disabled. Simply connecting an output to an
input does not produce the selected input at the selected output. The output must be enabled
using the codes shown below in Table 2.0.
EXAMPLE 2.1: To produce input 3 video/audio at output 1 the following code must be sent by
the host:
0x82 <5mS delay> 0x8C
The value 0x82 tells the switcher to connect output 1 to input 3
The value 0x8C tells the switcher to enable output 1
2.2
OUTPUT CONTROL
Outputs can be enabled or disabled. If the output is disabled, the switched connection
remains intact. Thus, re-enabling the output restores the previously connected input.
For example, let’s assume the steps in example 2.1 have occurred and input 3 is present at
output 1. If the output is then disabled by sending code 0x8B and then a code 0x8C is sent,
input 3 is present at output 1.
Ganged control of all outputs is possible using the DISABLE/ENABLE codes 0x8D and 0x8E
TABLE 2.0: SWITCHER CONTROL CODES
HEX VALUE
DESCRIPTION
0x8B
0x9B
0xAB
0xBB
0x8C
0x9C
0xAC
0xBC
0x8D
0x8E
Disable output 1
Disable output 2
Disable output 3
Disable output 4
Enable output 1
Enable output 2
Enable output 3
Enable output 4
Disable all outputs
Enable all outputs
