Usb 2.0 Switch Configuration; Setting The Active Usb Host; Power Switch Delay; Querying The Host Presence - Lightware MMX4x2 Series User Manual

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7. LW3 Programmers' Reference
7.24. USB 2.0 Switch Configuration
DIFFERENCE:
This section refers to the MMX4x2-HDMI20-USB-L model only.
7.24.1. Setting the Active USB Host
The command below is for selecting a USB B-type port (host computer) that will be connected to the USB
peripherals (USB A-type ports).
Command and Response #usb
SET·/MEDIA/USB/USBSWITCH.HostSelect=<host_nr>
ç
pw·/MEDIA/USB/USBSWITCH.HostSelect=<host_nr>
æ
Parameters
Parameter Parameter description
<host_nr> USB B-type port number.
Example
ç SET /MEDIA/USB/USBSWITCH.HostSelect=2
æ pw /MEDIA/USB/USBSWITCH.HostSelect=2
7.24.2. Power Switch Delay
After switching between the hosts, certain connected USB peripherals need to be reset to operate properly.
Enable the power switch delay function, then the 5V power of all the devices is off for 2 seconds. This forces
the devices to restart, thus you do not have to physically unplug/re-plug the connected USB device.
Command and Response
SET·/MEDIA/USB/USBSWITCH.DelayedSwitch=<delay_state>
ç
pw·/MEDIA/USB/USBSWITCH.DelayedSwitch=<delay_state>
æ
Parameters
Parameter Parameter description
<delay_state> 2 sec power-cut towards the devices
if host is changed
Example
ç SET /MEDIA/USB/USBSWITCH.DelayedSwitch=2
æ pw /MEDIA/USB/USBSWITCH.DelayedSwitch=2
MMX4x2 series – User's Manual
Value Value description
1-4 port number
0 off state
Value Value description
power cut-off is active
true
false power cut-off is inactive
Applied firmware package: v1.6.0b19 | LDC software: v2.5.13b5
7.24.3. Querying the Host Presence
The USB B-type ports can be queried to check if there is a USB host device connected to a port. The 5V signal
presence of a connected USB host device can be queried as follows:
Command and Response
GET·/MEDIA/USB/USBSWITCH.<host_pc>
ç
pr·/MEDIA/USB/USBSWITCH.<host_pc>=<status>
æ
Parameters
Parameter Parameter description
<host_pc> The ID of the host PC
<status> 5V signal presence of the
connected host
Example
ç GET /MEDIA/USB/USBSWITCH.Host5VSensePc1
æ pr /MEDIA/USB/USBSWITCH.Host5VSensePc1=true
7.24.4. Setting the 5V Sending to the USB Peripherals
The 5V power towards the USB A-type ports can be enabled or disabled as follows:
Command and Response
SET·/MEDIA/USB/USBSWITCH.<device_pwr>
ç
pw·/MEDIA/USB/USBSWITCH.<device_pwr>=<status>
æ
Parameters
Parameter Parameter description
<device_pwr> 5V output parameter of the
USB A-type port
<status> 5V power towards the USB
peripheral
Example
ç SET /MEDIA/USB/USBSWITCH.Device5vEnable1=false
æ pw /MEDIA/USB/USBSWITCH.Device5vEnable1=false
130
Value Value description
Host5vSensePc1
Host5vSensePc2
Host5vSensePc3
Host5vSensePc4
5V is detected
true
5V is not detected
false
Value Value description
Device5vEnable1
Device5vEnable2
Device5vEnable3
Device5vEnable4
5V is sent
true
5V is not sent
false