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Serial Communication (SCOM) Interface
Data Rate
The display is configured to transmit and receive data at 9600 bits/second.
Data Format
Data shall be transmitted with no parity, 8 data bits, one start bit, and one stop bit.
Message Format
The basic message format shall be as follows:
Byte #
0
1
ATTN
ADDR
The minimum message size is 7 bytes. The maximum message size is 82 bytes, consistent with
61162-1.
Attention (ATTN)
This byte is used to identify a start of message. It can be one of 3 values:
ATTN
Description
0x07
Command
0x06
Acknowledge
0x15
Negative Acknowledge (ASCII NAK)
A device shall send a command using the 0x07 Attention Code. The display will respond to the
command with either an ACK if the command completed successfully, or a NAK if the command
failed.
Address (ADDR)
This byte is used to specify a particular display to receive a Command and to identify the display
responding (ACK or NAK) to a Command. All Displays will support the broadcast address.
The display will meet all functional requirements without individual Display addressing.
The Address field shall have the following values:
ADDR
Description
Broadcast - Addressed to all
0xFF
displays
Address of a specific display
0x00 to 0x0F
(max of 16 Displays)
Command (CMD)
The command shall be one of the following values:
Communication Interface
IND100084-1
2,,
5
6
CMD
LEN
IHCHK DATA
(ASCII BELL)
(ASCII ACK)
6
7, etc
7+LEN
IDCHK
INB100005-3 (Rev 9)
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