6. LW2 Programmers’ Reference
DVI-OPT-220-Pro series – User's Manual
27
6.3.8.
Delete EDID from Memory
Description: Clear EDID from memory location <loc>.
Format
Example
Command
{DE<loc>}
→
{DEU*}
Response (DE_OK)CrLf
(E_S_C)CrLf
←
(DE_OK)CrLf
(E_S_C)CrLf
Explanation:
All user EDIDs are cleared from memory.
Legend: Depending on <loc>, one EDID, or all EDIDs in a block can be cleared.
<loc>
Result
Fxx
Not valid! Factory EDID cannot be deleted.
Uxx
Specified User EDID is deleted.
Dxx
Specified Dynamic EDID is deleted. It will be empty until a new monitor is connected.
Exx
Not valid! The EDID of the only one input cannot be deleted.
F*
Not valid! Factory EDID cannot be deleted.
U*
All User EDIDs are deleted.
D*
All Dynamic EDIDs are deleted. They will be empty until a new monitor is connected.
E*
Not valid! The EDID of the only one input cannot be deleted.
INFO: If not valid EDID is tried to delete, the response will be “ERR03”.
6.3.9.
Restart the Extender
Description:
The transmitter can be restarted without unplugging power.
Format
Example
Command {RST}
→
{RST}
Response -
←
Booting commands run…
Explanation:
The extender reboots and executes the booting commands.
6.4.
Extender Initiated Commands
6.4.1. EDID Status Changed (Transmitter)
Description:
This is sent after any command which changed the EDID table (EDID copy, EDID switch), or after
a new EDID source e.g. a new display device is connected to the extender.
Format
Example
Command various
→
a new monitor is connected to an output
Response (E_S_C) CrLf
←
(E_S_C) CrLf
Explanation: When a new monitor is connected to an output port, its EDID is read. The message from the
extender shows that an EDID has changed.
INFO: The extender stores the last attached display device’s EDID connected to the local monitor output.
After disconnecting this device its EDID is still present at the extender’s memory, therefore no status
change message is issued by the device if a display device having the same EDID is connected to that
output. (The same display device is connected again).
INFO: To keep your application in sync with the extender it is recommended to issue a watch validity
( {wvd}, {wvu}, {wve} ) commands after receiving an EDID status changed response, and read all location
indicating “3” or “4” in the table, as the change of these EDIDs triggered the (E_S_C) message.
6.4.2.
Port Status Changed
Description:
This message is sent when any value changes in the response for the {PS} command. The
message means that an input or output port’s state has changed e.g. a source or display device is connected
or disconnected.
Format
Example
Command none
→
an input port looses signal
Response (PSC) CrLf
←
(PSC)CrLf
Explanation:
An input port (which had signal present before) detects no signal. The extender sends a
message to indicate port status change.
INFO: The (PSC) message can be omitted by third party controller, or it can be used to trigger a {PS}
command. In the latter case, the controller can be up to date with the port status without continuous
queries.
Description:
The device responds its 8-digit serial number.
INFO: Old devices may have only the last 4 numbers written onto the back of the extender.
