Emergency Contents; Emergency Contents Display - NEC MultiSync C431 User Manual

24. Emergency Contents

This function which plays files in the EMRGENCY CONTENTS folder in the root folder on SD card
automatically using MEDIA PLAYER function.
During playing, a display prohibits operation except power off.
Create "EMERGENCY CONTENTS" folder in a route folder.
"Display command" starts playing, and "Delete command" stops playing.

24.1 Emergency Contents Display

This command is used in order to display Emergency Contents.
1) The controller requests the monitor to display Emergency Contents.
Header
SOH-'0'-Monitor ID-
'0'-'A'-'0'-'8'
Header
SOH (01h): Start of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID of which you want to change a setting.
Ex.) If Monitor ID is '1', specify 'A'.
'0' (30h): Message sender is the controller.
'A' (41h): Message type is "Command".
'0'-'8'(30h, 38h): Message length (8byte)
Message
STX (02h): Start of Message
'C'-'A'-'1'-'F' (43h, 41h, 31h, 46h): Emergency Contents Command
'0'-'1' (30h, 32h): Display
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 Security Enable to the controller.
Header
SOH-'0'-'0'-Monitor ID-
'B'-'0'-'A'
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', replying monitor's ID is '1'.
'B' (42h): Message type is "Command reply".
'0'-'A'(30h,41h): Message length (10byte)
Message
STX (02h): Start of Message
'C'-'B'-'1'-'F' (43h, 42h, 31h, 46h): Emergency Contents Reply Command
'0'-'1' (30h, 32h): Display
ST: Status
00h: No Error
01h: Error
ETX (03h): End of Message
Message
STX-'C'-'A'-'1'-'F'-'0'-'1'-ETX
Message
STX-'C'-'B'-'1'-'F'-'0'-'1'-ST-ETX
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Check code Delimiter
BCC CR
Check code
BCC
Delimiter
CR