3300 ACM Installation and Operation Manual Power Measurement Ltd.
G-12 Appendix G: Serial Communications Protocol
Request from Master:
14 FD 83 0A 00 00 64 00 00 00 00 00 FF 00 12
Response from 3300ACM:
27 FD 83 90 64 00 00 00 E4 0C 22 00 64 00 00 0A
64 00 00 0B 64 00 00 0C 64 00 00 0D AD 00 00 0E
AD 00 00 0F AD 00 00 10 AD 00 00 11 88 13 00 14
88 13 00 15 88 13 00 16 88 13 00 17 F4 01 00 1E
F4 01 00 1F F4 01 00 20 DC 05 00 21 00 00 00 22
00 00 00 23 00 00 00 24 00 00 00 25 E8 03 00 26
E8 03 00 27 E8 03 00 28 E8 03 00 29 F4 01 00 2A
F4 01 00 2B F4 01 00 2C DC 05 00 2D AE 0F 00 2F
DA 2F 01 36 00 00 00 37 93 0E 00 40 00 00 00 41
1F 05 00 85 55
Figure G-4 Read Registers Example
Figure G-5 Write Registers Example
5.2 WRITE REGISTERS EXAMPLE
Figure G-5 demonstrates is an example of a register write
to set the voltage scales, current scale and voltage mode of
a meter with unit ID 100 and a password of 0. The
Master will write the following information to the 3300
ACM:
• PT primary voltage 1200
• PT secondary voltage 120
• CT primary current 5000
• Voltage mode 0
Write command from Master:
14 FD 81 1C 00 00 64 00 00 00 05 00 0A 00 00 00
B0 04 00 01 78 00 00 02 88 13 00 03 00 00 00 04
21
Response from 3300ACM:
27 FD 81 07 64 00 00 00 E4 0C FF 27
5 PACKET EXAMPLES
The following two sections contain examples of actual packets
sent to a 3300 ACM meter, and the response packets issued
by that meter. To make the packets easier to read the bytes
have been blocked into groups of 4.
5.1 READ REGISTERS EXAMPLE
Below is an example of a request from a Master Station to unit
100. The request is for all registers in the range 0000 to 00FF
hex, which is a request for all real-time and demand param-
eters. The Master Station has ID number 0.
Courtesy of NationalSwitchgear.com
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