NEC X981UHD External Control Codes - Page 81
Direct TV Chanel Read & Reply
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14. Direct TV Chanel Read & Write When DTV unit (Option unit) is installed, channel settings is read and write directly. 14.1 Direct TV Chanel Read & Reply 1) The controller requests the monitor to read channel information. Header Message Check code SOH-'0'-Monitor ID- STX-'C'-'2'-'2'-'C'-ETX BCC '0'-'A'-'0'-'6' Delimiter CR 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". '0'-'6'(30h, 36h): Message length Message STX (02h): Start of Message 'C'-'2'-'2'-'C' (43h, 32h, 32h, 43h): Direct TV Channel Read command ETX (03h): End of Message Check code BCC: Block Check Code Refer to the section 4.3 "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' Message STX-'C'-'3'-'2'-'C'MajorCH-MinorCH-ETX Check code Delimiter BCC CR 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'-'C' (43h, 33h, 32h, 43h): Direct TV Channel read 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 4.3 "Check code" for a BCC calculation. Delimiter CR (0Dh): End of packet (81/130)