ABB A43

Communication with M-Bus
2CMC48001M0201 277 A43/A44
Revision: C User Manual
10.5.6 Set voltage transformer (VT) ratio - primary voltage
The voltage transformer ratio (VT) primary voltage is set by sending the follow-
ing command (all values are hexadecimal). The command is affected by the write
protection level set.
Byte No.
Size
Value
Description
1
1
68
Start character
2
1
0a
L-field, calculated from C field to last user data
3
1
0a
L-field, repeated
4
1
68
Start character
5
1
53/73
C-field, SND_UD
6
1
xx
A-field, address
7
1
51
CI-field, data send, LSB first
8
1
04
DIF size, 32 bit integer
9
1
FF
VIF next byte is manufacturer specific
10
1
21
VIFE VT ratio primary voltage
11-14
4
xxxxxxxx
New VT ratio primary voltage
15
1
xx
CS checksum, calculated from C field to last data
16
1
16
Stop character
10.5.7 Set current transformer (CT) ratio - secondary current
The current transformer ratio (CT) secondary current is set by sending the follow-
ing command (all values are hexadecimal). The command is affected by the write
protection level set.
Byte No.
Size
Value
Description
1
1
68
Start character
2
1
0a
L-field, calculated from C field to last user data
3
1
0a
L-field, repeated
4
1
68
Start character
5
1
53/73
C-field, SND_UD
6
1
xx
A-field, address
7
1
51
CI-field, data send, LSB first
8
1
04
DIF size, 32 bit integer
9
1
FF
VIF next byte is manufacturer specific
10
1
22
VIFE CT ratio secondary current
11-14
4
xxxxxxxx
New CT ratio secondary current
15
1
xx
CS checksum, calculated from C field to last data
16
1
16
Stop character