Toshiba SX 2000 - Manual (Page 42)

1.3.8 Computer link protocol
This section introduces the general message format of the T-series computer link
protocol and the types of commands which are used for the S2T.
For details of the T-series computer link protocol, refer to the separate manual
"T-series Computer Link Operation Manuai".
Generai message format
1.3 Computer link mode
Max.255bytes
1 2 3 4 5 6 7
( A ADR CMD DATA & SUM )/; CR
Checksum creation range
Text contents
( Start code (H28) Ibyte
A Format identification code (FI41) Ibyte
ADR .......... Station number
01 (H3031) through 32(H3332)
2byte
CMD ......... Command 2byte
DATA ........ Data field - depending on the command (max.244bytes)
& Checksum delimiter (FI26) Ibyte
SUM .......... Checksum
ASCII code of the lowest one byte of the sum obtained by
addingfrom the start code ’(’ to the checksum delimiter
See the following example.
2byte
) End code (H29) Ibyte
? ..........................
End code (H3B)
in case of halfway of entire data
Ibyte
CR Carriage return code (FIOD) Ibyte
Checksum creation example:
( A 0 1 s T & 9 7 ) CR
/\
Lower two digits
■(’ = H28
‘A’ = H41
‘0’ = H30
‘1’ = H31
‘S’ = H53
‘T’ = H54
■&’ = H26
HI 97-^ Sum
6F8C0926 25