Moxa MPC-2190Z [62/70] Cmd message commands and queries

MPC-2190 Hardware Display Control Interface

6-6

CMD (Message Commands and Queries)

The command can be one of the following values. For details, refer to Appendix B: Display Control Interface

Commands.

CMD 0 CMD 1 CMD 2 ASCII Description

0x42 0x52 0x49 “BRI” Brightness Minimum Value

0x42 0x52 0x4C “BRL” Set LED Brightness of Touch Keypad

0x42 0x52 0x4D “BRM” Brightness Maximum Value

0x42 0x52 0x54 “BRT” User Brightness Control

0x42 0x52 0x55 “BRU” Glass Display Control - Brilliance Button

0x42 0x5A 0x5A “BZZ” Buzzer Control

0x44 0x4C 0x4E “DLN” Download ECDIS RGB package

0x44 0x4C 0x3F “DL?” ECDIS RGB package Query

0x45 0x54 0x43 “ETC” Elapsed Time Counter Query

0x47 0x4D 0x42 “GMB” Glass Display Control - Minimum Brightness

0x50 0x4F 0x54 “POT” Potentiometer Control

0x53 0x57 0x49 “SWI” Scalar Firmware Version Query

0x53 0x57 0x4B “SWK” Touch Keypad Firmware Version Query

0x41 0x44 0x46 “ADF” AC Input Power Detect Function

0x41 0x44 0x3F “AD?” Query AC Input Power Detect Function Status

0x42 0x4C 0x49 “BLI” Brightness Control

0x44 0x55 0x46 “DUF” Disable UART Command Function

0x45 0x4D 0x53 “EMS” ECDIS Mode Select

LEN (Data Length)

This byte defines the length of data in the message in bytes. The maximal value for this field is 74 bytes, and

the minimal value is 0 byte.

IHCHK (Inverse Header Checksum)

This is a simple 8-bit checksum of the header data, message bytes 0 to 5. The 8-bit sum (without carry) of

bytes 0, 1, 2, 3, 4, 5, and 6 shall be 0xFF.

If a message is received with an incorrect checksum, the display will replay with the attention code set to NAK.

DATA (Data Field)

The data field shall only be transmitted if LEN is larger than 0. This field depends on the CMD transmitted.

IDCHK (Inverse Data Checksum)

These bytes shall be only transmitted if LEN is larger than 0. This is a simple 8-bit checksum of the data field,

message bytes 7 to 7+ (LEN-1).

The 8-bit sum (without carry) of bytes 7 through 7+LEN inclusive shall be 0xFF. The receiver will reply to any

message that the checksum has failed with the attention code set to NAK.