Hatteland Display 20 inch - HM 20T07 CMD User Manual

Page 54

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54

Serial Communication (SCOM) Interface

Communication Interface

IND100084-1

Manufacturer ID “MAN”

This command shall be sent to the unit to request Manufacturer ID Code. 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 value that is unique for each manufacturer.

Examples:

Command Manufacturer ID Code:

0x07

0xFF

0x4D

0x41

0x4E

0x00

0x1D

Acknowledge Manufacturer ID Code “JHD”:

0x06

0xFF

0x4D

0x41

0x4E

0x03

0x1B

0x4A

0x48

0x44

0x29

Unit ID Model/Version Number “VER”

This command shall be sent to the unit in order to identify unit type by preassigned code and, establish the version of

the serial communications interface software. No data shall be sent with this command.

Any future revisions, such as additions or changes to the commands or data fields shall be coordinated with a

difference in the unit Version Number. The unit will reply to this command with an ACK attention code. The DATA field

has a unique 1-byte unit model code. The next 2 bytes shall contain major and minor version of the serial

communication protocol in use. Currently the unit model field is set to 0x01. The Version Number field for version 1 is

set to 0x01 0x00.

Examples:

Command Unit Model/Version Number:

0x07

0xFF

0x56

0x45

0x52

0x00

0x0C

Unit Version 1.0:

0x06

0x05

0x56

0x45

0x52

0x03

0x04

0x01

0x01

0x00

0xFD

Potentiometer control “POT”

The unit may allow the backlight to be controlled by the local control (potentiometer) mounted on the front of the unit

by the remote control, or by the combination of the two. This command provides means to enable/disable the

potentiometer. LEN = one data byte.

0x00

Disables the potentiometer. Backlight controlled only by the remote control.

0xFF

Enables the potentiometer. Backlight is controlled by both the remote serial

interface and the potentiometer. (Default)

Note: In this setting, with the BRT command at 100%, the front potentiometer has

full control of the backlight. This is the initial setting when a unit is powered on.

If the data checksum is valid, the unit will reply to this command with an ACK attention code. The DATA field will

indicate the resulting control setting. If an invalid data checksum was received and the message was not broadcast

and RS485 (for units that support it), the unit will reply with a NAK attention code and the current control setting.

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