ViewSonic CD3200 viii The following is an example of PC requesting the volume value from the LCD M onitor:
PC send Get-Volume-value packet to Monitor (In ASCII)
Name Length Command Value1 Value2 Value3 CR
Byte Count 5 f 0 0 0 00D
Bytes order 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 b elow:
LCD-Monitor response packet to Get-volume-value (in this example t he volume value is 50):
Name Length Value1 Value2 Value3 Value4 CR
Byte Count 5 0 0 5 0 00D
Bytes order 1 2 3 4 5 6
The following is an example of PC requesting the On-hours value from the LCD Monitor
PC send “Get-On hours” command to Monitor (In ASCII)
Name Length Command Value1 Value2 Value3 CR
Byte Count 5 m 0 0 0 00D
Bytes order 1 2 3 4 5 6
LCD Monitor will send “-” (02Dh), “CR” bytes to PC if the command is not valid
Otherwise the LCD Monitor will respond with the On-Hours value as outline d below:
LCD-Monitor response packet to Get-On-hours value is 12,500 hours):
Name Length Value1 Value2 Value3 Value4 Value5 CR
Byte Count 6 1 2 5 0 0 00D
Bytes order 1 2 3 4 5 6 7
Note that this response contain 6-bytes
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 Length Command Value1 Value2 Value3 CR
Byte Count 5 z 0 0 0 00D
Bytes order 1 2 3 4 5 6
LCD Monitor will send “+” (02Bh); “CR” bytes to NMP-530 after receiving the com mand indicating that the
communication link is OK