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485SDA103798 Manual 13
B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
The decimal and hexadecimal equivalents of some ASCII characters
are shown in Table 3.2. Notice that the ASCII representation of the
character “0” does not have a value of 0. Refer to Appendix C for
more ASCII, decimal, and hexadecimal equivalents.
Table 3.2 - Equivalent Values
Syntax
The command string consists of four bytes. The first byte is the
start of message byte. The start of message byte is always the “!”
character. The second byte is the address byte. This byte allows
each unit to have a unique address. The factory default address is
the ASCII “0” (zero) character. The next two bytes are the
command characters. These bytes are used to specify which
command the module will execute. The read A/D and digital I/O
commands require an additional data byte.
Command Syntax: ! _ _ _
| | | | |
| | | | Data Byte
| | | 2nd Command Byte
| | 1stCommand Byte
| Address Byte
Start of Message Byte
Reading A/D Channels Command
ASCII Decimal Hexadecimal
! 33 21h
0 48 30h
A 65 41h
D 68 44h
O 79 4Fh
R 82 52h
S 83 53h
NUL 0 0h
SOH 1 1h
STX 2 2h
ETX 3 3h
EOT 4 4h
ENQ 5 5h
ACK 6 6h
BEL 7 7h