Direct Tv Chanel Write & Reply - NEC LCD Monitor Manual

14.2 Direct TV Chanel Write & Reply
1) The controller requests the monitor to write channel information.
Header
SOH-'0'-Monitor ID-
'0'-'A'-'1'-'2'
Header
SOH (01h): Start of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID which you want to get Model Name.
Ex.) If Monitor ID is '1', specify 'A'.
'0' (30h): Message sender is the controller.
'A' (41h): Message type is "Command".
'1'-'2'(31h, 32h): Message length = 18bytes
Message
STX (02h): Start of Message
'C'-'2'-'2'-'D' (43h, 32h, 32h, 44h): Direct TV Channel write command
MajorCH: Major Channel (00000000h – FFFFFFFFh),
'0'-'0'-'0'-'0'-'0'-'0'-'0'-'0' - 'F'-'F'-'F'-'F'-'F'-'F'-'F'-'F'
MinorCH: Minor Channel (0000h – FFFFh),
'0'-'0'-'0'-'0' - 'F'-'F'-'F'-'F'
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 "Check code" for a BCC calculation.
Delimiter
CR (0Dh): End of packet
2) The monitor replies the result to the controller.
Header
SOH-'0'-'0'-Monitor ID-
'B'-'1'-'2'
Header
SOH (01h): Start of Header
'0' (30h): Reserved
'0' (30h): Message receiver is the controller.
Monitor ID: Indicate a replying Monitor ID.
Ex.) When this byte is set to 'A', the replying Monitor ID is '1'.
'B' (42h): Message type is "Command reply".
'1'-'2'(31h, 32h): Message length = 18bytes
Message
STX (02h): Start of Message
'C'-'3'-'2'-'D' (43h, 33h, 32h, 43h): Direct TV Channel write reply command
MajorCH: Major Channel (00000000h – FFFFFFFFh),
'0'-'0'-'0'-'0'-'0'-'0'-'0'-'0' - 'F'-'F'-'F'-'F'-'F'-'F'-'F'-'F'
MinorCH: Minor Channel (0000h – FFFFh),
'0'-'0'-'0'-'0' - 'F'-'F'-'F'-'F'
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 "Check code" for a BCC calculation.
Delimiter
CR (0Dh): End of packet
Message
STX-'C'-'2'-'2'-'D'-
MajorCH-MinorCH-ETX
Message
STX-'C'-'3'-'2'-'D'-
MajorCH-MinorCH-ETX
(77/137)
Check code Delimiter
BCC CR
Check code
BCC
Delimiter
CR