Psge 04
2
4
2
2
2
2
2
2
2
2
2
1
1
1
1
1
1
6
8
10
12
14
16
29
30
31
32
33
34
0
1
2
3
4
5
6
7
8
1
2
3
5
1
2
3
4
5
6
7
9
10
11
13
12
8
4
Meter ADD
Function code
Meter ADD
Meter ADD
Function
code
Function code
Start ADD
High bit
Start ADD
Low bit
Data byte
Length
high bit
Data byte
Length
low bit
CRC code low
bit
CRC code high
bit
0x01
0x01
0x01
0x10
0x00
0x01
0x00
0x02
0x10
0x08
0x10
0x00
0x01
0x00
0x04
0x00
0x00
0x03
0xE8
0x32
0xDD
0x02
0x83
0x02
0xC2
0xC1
Slave normal answer (write multi-register)
Slave abnormal answer(Read multi-register)
Data 1
high bit
Data 1
low bit
Data 2
high bit
Data 2
low bit
CRC code
low bit
CRC code
high bit
CRC code low bit
CRC code high bit
Error code
1
2
3
5
4
Meter ADD
Function code
0x01
0x0000
0x0002
0x0004
0x0006
0x0008
0x000A
0x000C
0x000E
0x0010
0x001D
0x001E
0x001F
0x0020
0x0021
0x0022
0x90
0x02
0xCD
0xC1
Slave abnormal answer (write multi-register)
CRC code low bit
CRC code high bit
Error code
Abnormal answer: (For example: host request function code 0x03
）
2. Write multi-register
For example: Host write HY1 (1st alarm value hysteresis 1.0)
ADD code of HY1 is 0x0001
，
because HY1
（
4 byte
），
seizes 2 data registers. The hexadecimal memory code of decimal floating point number
1.0 *1000=1000 is 0x000003E8.
Host request (write multi-register)
Data byte
Length
Start ADD
high 8 bit
Start ADD
low 8 bit
Data byte Length
high bit
Data byte Length
low bit
Data location error response: (For example:Host request the ADD index is 0x0050)
Address Mapping Table of Meter Parameters
No
ADD
mapping
Variable name
Data
Length
Range
Read/write
Rate
Remark
1st loop alarm value AL1
1st loop alarm hysteresis HY1
2nd loop alarm value AL2
2nd loop alarm hysteresis HY2
Coefficient Ct
Analog output high limit value rH
Analog output low limit value rL
Amendment value PS
Read measured value
-1999~9999
-1999~9999
-1999~9999
-1999~9999
0~9999
-1999~9999
-1999~9999
-1999~9999
0~9999
0~2
0~1
0~1
0~3
0~1
0x255
R/W
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
Reserve
Reserve
INP measure channel
1st loop alarm type Ad1
2nd loop alarm type Ad2
Alarm status indication
Baud rate
Meter address Add
1
1
1
1
1
1
1
1
35
0x0023
0xD1
R
Meter name
Note
①
Note
①
Note
③
Note
②
R: read only; R/W: read/write.
Note
①：
alarm type
High limit alarm
Communication value
Communication
value
Low limit alarm
Communication value
H
1
L
0
1
9.6
0
4.8
Note
②
: baud rate
Menu display
Note
③
: alarm status indiction
D7
D6
D5
D4
D3
D2
D1
D0
AL2
AL1
16 digits CRC check code acquisition program
unsigned int Get_CRC(uchar *pBuf, uchar num)
{
unsigned i,j;
unsigned int wCrc = 0xFFFF;
for(i=0; i<num; i++)
{
wCrc ^= (unsigned int)(pBuf[i]);
for(j=0;
j<8;
j++)
{
if(wCrc & 1){wCrc >>= 1; wCrc ^= 0xA001; }
else
wCrc
>>=
1;
}
}
return wCrc;
}
