Power Measurement 3300 ACM User Manual

3300 ACM Installation and Operation Manual Power Measurement Ltd.
Appendix G: Serial Communications Protocol G-7
3.2 WRITE REGISTERS PACKET
This packet allows the master to program the setup param-
eters of a 3300 ACM meter. In order to write to a meter the
meter password must be known and placed in the password
location of the write registers packet.
4 REGISTER LIST
The basic model 3300 ACM is equipped with the following
registers:
10,11,12,13,14,15,16,17,20,21,22,23,33,54,55
These represent Van, Vbn, Vcn, Vln average, Vab, Vbc, Vca,
Vll average, Ia, Ib, Ic, I average, total kW, total kW hours and
total GW hours. In addition, the 3300 ACM may be
equipped with any of the parameters listed as optional in
Figures G-3a to G-3c. A 3300 ACM may contain up to 40
different parameters.
The page 10 setup registers are common to all 3300 ACM
meters and are not counted as part of the maximum 40
possible parameters. Figures G-3a to G-3e list all possible
data registers. Figure G-3d lists the 3300 ACM setup
registers.
Figure G-2 Write Registers Packet
NOTES
1. There is no requirement to specify all registers, or to assign them in any particular order. For example, if you wish to change only the Amp scale, a packet
may be sent with only that constant.
2. A write to a protected Read/Write register requires that the password stored in the device be sent in the write packet or the write command will be ignored.
For a write to an unprotected Read/Write register the password is not required. At present, all 3300 registers are protected.
3. The device responds with an acknowledge packet. If all registers were successfully written to the device will respond with 0xFFH in the Ack/Nack byte
otherwise it will respond with 0x00H in the Ack/Nack byte.
WRITE REGISTER PACkET
(Master to 3300 ACM)
14 (1 byte)
FD (1 byte)
81 (Protected write command) (1 byte)
Length (1 byte)
Master address (2 bytes)
3300 address (2 bytes)
Password (2 bytes)
Number of Registers in Packet (2 bytes)
1st Register (4 bytes)
2nd Register (4 bytes)
...
nth Register
...
LRC (1 byte)
WRITE RESPONSE PACKET
(3300 ACM to Master)
27 (1 byte)
FD (1 byte)
81 ([Protected] write command) (1 byte)
Length (1 byte)
3300 address (2 bytes)
Master address (2 bytes)
Device Type (2 bytes)
Ack/Nack (1 byte)
LRC (1 byte)
Courtesy of NationalSwitchgear.com

Power Measurement 3300 ACM Specifications

General

Brand	Power Measurement
Model	3300 ACM
Category	Measuring Instruments
Language	English