ViewSonic CD4620, VS11915 Byte Count 00D Bytes order, Length Value1 Value2 Value3 Value4 00D

Value[1-4]:

6.2Get-Function Listing

The PC can interrogate the LCD Monitor for specific information. The Get-Function packet format consists of 5 bytes which is similar to the Set-Function packet structure. Note that the “Value” byte is always = 00.

Get-Function description:
	Length:	Total bytes of message = 5 ASCII (35H), excluding “CR”
	Command:	Get-Function command code: One byte ASCII code
	Value[1~3]:	Always = 000
Get-Function format from PC to LCD (ASCII)
	Name	Length	Command	Value1	Value2	Value3	CR
	Byte Count	5	1 Byte	0	0	0	00D
	Bytes order	1	2	3	4	5	6

Monitor shall response to Get-Function with the following packet format:

LCD Monitor response packet format:

Name	Length	Value1	Value2	Value3	Value4	CR
Byte Count	5	1 Byte	1 Byte	1 Byte	1 Byte	00D
Bytes order	1	2	3	4	5	6

Response packet (to Get-Function):

Length: Total bytes of packet = 5 ASCII excluding “CR”

Exception: Total bytes for On-Hours = 6

Four ASCII codes: Value range is from 0000 ~ 9999

Exception: Value[1-5] for On-Hours

LCD Monitor will send “+” (02Bh), “CR” bytes to PC after receiving a valid command LCD Monitor will send “-” (02Dh), “CR” bytes to PC if the command is not valid

ƒThe following is an example of PC requesting the volume value from the LCD Monitor:

PC send Get-Volume-value packet to Monitor (In ASCII)

Name

Byte Count

Bytes order

Length	Command	Value1	Value2	Value3	CR
5	f	0	0	0	00D
1	2	3	4	5	6

LCD Monitor will send “-” (02Dh), “CR” to PC if command is not recognized. Otherwise the LCD Monitor will respond with the volume value as outlined below:

LCD-Monitor response packet to Get-volume-value (in this example the volume value is 50):

Name

Byte Count

Bytes order

Length	Value1	Value2	Value3	Value4	CR
5	0	0	5	0	00D
1	2	3	4	5	6

A special command “Get-ACK” is used to test the communication link between PC and the LCD Monitor. The LCD Monitor shall response to “Get-ACK” command with a “+” or “-“.

Get-ACK from PC to LCD (ASCII)

Name

Byte Count

Bytes order

Length	Command	Value1	Value2	Value3	CR
5	z	0	0	0	00D
1	2	3	4	5	6

LCD Monitor will send “+” (02Bh); “CR” bytes to PC after receiving the command indicating that the communication link is OK

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