Baldor VS1MD instruction manual Ascii-Hex

Description:

Request starts with “ENQ” and ends with “EOT”.

Acknowledge Response starts with “ACK” and ends with “EOT”. Negative Acknowledge Response starts with ”NAK” and ends with “EOT”. “Drive Number” is the number of the drive and is indicated in 2 byte ASCII-HEX. (ASCII-HEX: Hexadecimal consists of ‘0’ to ‘9’, ‘A’ to ‘F)

CMD: Capital letter

Character	ASCII-HEX	Command
R	52h	Read
W	57h	Write
X	58h	Request for monitoring
Y	59h	Action for monitoring

Data: ASCII-HEX
Example: when data value is 3000: 3000 (dec)	‘0’ ‘B’ ‘B’ ‘8’h	30h 42h 42h 38h
Error code: ASCII (20h to 7Fh)

Receive/Send buffer size: Receive= 39 byte, Send=44 byte

Monitor register buffer: 8 Word

SUM: to check the communication error

SUM= ASCII-HEX format of lower 8 bit of (Drive No. + CMD + DATA)

Example: Command Message (Request) to read one address from address “3000”

ENQ	Drive	CMD	Address	Number of address to	SUM	EOT
	No			read
05h	“01”	“R”	“3000”	“1”	“A7”	04h
1 byte	2 bytes	1 byte	4 bytes	1 byte	2	1

SUM = ‘0’ + ‘1’ + ’R’ + ‘3’ + ‘0’ + ‘0’ + ‘0’ + ‘1’ =30h + 31h + 52h + 33h + 30h + 30h + 30h + 31h

= 1A7h (Control values such as ENQ/ACK/NAK are excluded.)

RS485 Protocol C-5