Fuji Electric Monitouch S8 series, Connection Manual

Page: 351 / 406

23-16 23. Universal Serial Communication
Sum Check Code (SUM)
Data is added up (SUM), and the lower one byte (8 bits) of the sum is converted into a two-digit ASCII code (HEX).
Example:
Transmission mode: without CR/LF, with sum check
The sum check code is added as shown below when data “3882” (OF2AH) is transmitted to the address “$u1453”
(05ADH) using the command [WM] (data writing).
* In the case of an interrupt, data from ENQ to ETX is subject to a sum check.
Error Codes
An error code is sent along with an NAK response as a two-digit ASCII code (HEX).
STX DLE ETX SUM
02
H
57
H
4D
H
10
H
30
H
35
H
41
H
44
H
03
H
34
H
44
H
"W" "M" "0" "5" "A" "D" "4" "D"
02H + 57H + 4DH + 10H + 30H + 35H + 41H + 44H + 30H + 30H + 30H + 31H
+ 30H + 46H + 32H + 41H + 03H =
34D
H
30
H
30
H
30
H
31
H
"0" "0" "0" "1"
30
H
46
H
32
H
41
H
"0" "F" "2" "A"
Command Address Count Memory data
Error Codes Contents
01H
The S8 series is currently engaged in display processing.
The received command is on standby due to display processing.
Wait a few moments and re-transmit the command.
02H
Overrun/Framing error
An overrun or framing error is detected in the received data.
Send the command again.
03H
Parity error
A parity error is detected in the received data.
Send the command again.
04H
Sum check error
A sum error occurs with the received data.
05H
Address error
The address specified by the memory read/write command is incorrect.
Check the address or counter and re-transmit the command.
06H
Count error
The memory read/write count is “0”.
07H
Screen error
The data to be written in read area n + 2 (screen status command), as specified by a write
command, is not registered on the screen.
Check the screen number and re-transmit the data.
08H
Format error
The number of DLEs is 0 or greater than 6.
09H
Received data over
The number of write command data received from the host exceeded that of data shown
below.
• Write memory command = 512 words
• Write CHR command = 1024 bytes
0BH
Retry command error
When a retry command is received, there is no BUSY status (NAK [01]) command.
0FH
ETX error
No ETX code is found.
10H
DLE error
No DLE code is found.
11H
Character error
A character not used in the received data is found (other than 0 to F).
Check the character and send the command again.
12H
Command error
An invalid command is given.