Pinnacle Technology OS2CX - Page 20

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2．When LRN is not 0, DT SUM‟s CRC checksum is only related with DATA column, and
is not related to the prior 13 bytes, at this time, data package total length is （13＋LEN＋2）
byte.
3．High order is in front and the low order is in rear to multi-byte column.
2． Communication package format explanation：
3． .communication command：
CMD1
CMD2
PARA1
PARA2
EXPLANATION
0x80
0x00
Baud Rate
0x00
Set communication baud rate
0x80
0x01
Frq
0x00
set measuring result sending frequency
0x80
0x02
0x00
0x00
read measuring result
0x80
0x03
0x00
0x00
start zero device
0x80
0x04
0x00
0x00
start tare device
0x80
0x05
Tare
start or stop preset tare device
0x80
0x06
Unit
0x00
set measuring unit
0x80
0x0d
0x00
0x00
The response of OP box（Command failure）
0x80
0x0e
0x00
0x00
The response of OP box（Command success ）
2）Command explanation:
4． Set communication baud rate：（ Successful response 0x800E，Failure response 0x800D）
STX
ID
CMD
PARA
PGNO
LEN
SUM
0xAB
0x00000000
0x8000
0xXX00
0
0x00
X
Default the baud rate is 9600bps when power on. When the command is received successfully, change
baud rate by parameter PARA1.
XX = 0x01 : 115200 bps
XX = 0x02 : 57600 bps
XX = 0x03 : 38400 bps
XX = 0x06 : 19200 bps
XX = 0x0C : 9600 bps
Command use method：PC use the default baud rate 9600bps to send this command to OP box firstly, and
then continue to use 9600bps baud rate to response after OP box received the command. Then switch the
S/N
items
explanation
length（bytes）
mark
1
STX
Package head
1
Communications packet starting marks 0xAB
2
ID
Scale number
4
keep，fill all with 0
3
CMD
command
2
Command classification
4
PARA
parameter
2
Parameter related with command
5
PGNO
Package
number
1
Data package number（single/last one fill with0）
6
LEN
length
2
data length
7
SUM
checksum
1
The sum form item1to item6, total 12 bytes
8
DATA
data
LEN
Command data，Max 49 bytes
9
DT
SUM
Data
checksum
2
CRC checksum of 8