Hatteland Display 20 inch - HM 20T07 CMD - Manual (Page 55)

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Serial Communication (SCOM) Interface
Communication Interface
IND100084-1
Unit control command “MCC”
This command is used for communication with the video interface controller of the unit to allow remote command of
the unit’s setup parameters. The video controller commands are transmitted in the data field. See appendix for
complete list of controller commands. Please note that this feature is not supported by all video controllers / units.
For future products, it can not be guaranteed that all commands will still be available.
Note: Maritime Multi Computer (MMC) units do not have a video interface controller internally and the MCC command
is therefore not supported.
If the checksum is valid, the unit will reply to this command with an ACK attention code, where the data field contains
the original command followed by acknowledge from the controller, as described in the appendix. If the checksum is
invalid and the message was not broadcast and RS-485 (for units that support it), the unit will reply to this command
with a NAK attention code, where the data field contains the original command.
Examples:
Command 50% contrast 0x82 0x41 0x38 0x30:
(50% of 0xFF=0x80. In ASCII 80 will be: 0x38 0x30)
0x07 0xFF 0x4D 0x43 0x43 0x04 0x22
0x82 0x41 0x38 0x30 0xD4
Acknowledge 50% Contrast:
0x06 0x03 0x4D 0x43 0x43 0x06 0x1D
0x82 0x41 0x38 0x30 0x38 0x30 0x6C
Unit Type/Model Number “TYP”
This command shall be sent to the unit in order to identify the unit type by its model number / part number. No data
shall be sent with this command.
The unit will reply to this command with an ACK attention code. The DATA field will be set to an ASCII string to
indicate the specified Type/Model Number, e.g: “JH23T01MMD-A1”
Examples:
Command Type/Model Number
0x07 0xFF 0x54 0x59 0x50 0x00 0xFC
Acknowledge Type/Model Number “JH20T03”:
0x06 0xFF 0x54 0x59 0x50 0x07 0x1A
0x4A 0x48 0x32 0x30 0x54 0x30 0x33 0x54
Operational Requirements
The following sections define the operational requirements.
Initial and Default Unit Conditions
After any power cycle, the unit will start-up with the maximum brightness control range available at the local control
and with combined control of the backlight enabled from both the local control (potentiometer) and the remote BRT
command. If no serial messages are received, the unit will stay in this configuration.