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UDM Hub Control Protocol
Command Summary
Command
Connect
Disconnect
Cascade input select
Lock Port
Unlock port
Query port
Get port or input name
Get receiver info
Send remote command 87 X
Get remote serial buffer 89 X
Set hub ID
Get hub or port ID
Reset
Set Protocol
Set port range
Basic Commands
Input Numbering
The UDM has a flexible architecture to maximise use of the available matrix. The UDM1604 is a 16 output
port hub, with four analog input ports and four TVM input ports. Each analog input port can be used for a
variety of input types, VGA, S-Video, component and composite, and input ports are specified by a main
number, together with a sub input number if the input can be split.
The Input number is specified as follows:
Value
1
2
3
4
If the Input is of type 1 (composite) then the Sub input field (with values 1,2,3) can further specify which of
the three composite inputs on an Input to use for this connection.
Input A would come from the 'A' labelled VGA connector or if the cascade input is selected for this input,
from the upstream hub.
Port Numbering
There are 16 output ports, numbered 1 to 16.
Connect Input to Port
Selects the input on the ports specified by the Port property, or if non zero, the port specified in the command.
Byte #
Byte value
110
0
1
2
1
X
Port
6
X
Port
9
X
Input
2
X
Port
3
X
Port
12 X
Port
79 X
Port
88 X
Port
Port
Port
67 X
Length of ID string
78 X
Port
99 X
156
75 X
Protocol
66 X
Min
Description
Input A
Input B
Input C
Input D
0
1
2
1
User Defined
Port
UDP
3
Input
Cascade value
Sub port
Remote
command
Terminator
Start of string (data)
Max
Value
Description
5
TVM input 1
6
TVM input 2
7
TVM input 3
8
TVM input 4
3
4
Input
Sub Input
UDM-0404 4x4 Multi-Format Distribution Hub
4
5
6
Type
Remote
parameters
5
Input Type
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