Viewsonic CD4220 User Manual download pdf (Page 51)

5.3 Get-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 Byte of Message excluding “CR”

TV ID

Identification for each of TV

Command Type

Identify command type,

“g” (0x67h) : Get Command

Command:

Function command code: One byte ASCII code

Value[1~3]:

Three bytes ASCII that defines the value

0x0D

Get-Function format

Send: (Command Type=”g”)

Name Length ID Command Type Command Value1 Value2 Value3 CR

Byte

Count

1 Byte 2 Byte 1 Byte 1 Byte 1 Byte 1 Byte 1 Byte 1 Byte

Bytes

order

1 2~3 4 5 6 7 8 9

Reply: (Command Type=”r” or “-”)

If the Command is valid, Command Type =”r”

Name Length ID Command Type Command Value1 Value2 Value3 CR

Byte

Count

1 Byte 2 Byte 1 Byte 1 Byte 1 Byte 1 Byte 1 Byte 1 Byte

Bytes

order

1 2~3 4 5 6 7 8 9

If the Command is Not valid, Command Type=”-“

Name Length ID Command Type CR

Byte

Count

1 Byte 2 Byte 1 Byte 1 Byte

Bytes

order

1 2~3 4 5

Example1: Get Brightness from TV-05 and this command is valid.

The Brightness value is 67.

Send (Hex Format)

Name Length ID Command Type Command Value1 Value2 Value3 CR

Hex 0x38 0x30

0x35

0x67

0x62 0x30 0x30 0x30 0x0D

Reply(Hex Format)

Name Length ID Command Type Command Value1 Value2 Value3 CR

Hex 0x38 0x30

0x35

0x72

0x62 0x30 0x36 0x37 0x0D

Example2: Get Brightness from TV-05 , but the Brightness command ID is error

and it is NOT in the command table.

Send (Hex Format)

Name Length ID Command Type Command Value1 Value2 Value3 CR

Hex 0x38 0x30

0x35

0x67

0XD3 0x30 0x30 0x30 0x0D

Reply (Hex Format)

Name Length ID Command Type CR

Hex 0x34 0x30

0x35

0x2D

0x0D

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Viewsonic CD4220 User Manual Page 51

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