Archive:CALMU3

Calmu3 (possibly Calmu3+) from Polymeters Response International. "The first microprocessor-based meter", using "FFT, rather than 'brute-force' DSP" [1]

I think I read somewhere that Calmu3 (minus the +) lacks CoP5 approval, but the picture in the manual shows the same as ours.

It may need calibration periodically, but that's probably up to the supplier.

Details

• Serial no: P99A01869
• Part no: C3DBD0BC0SJ (3 phase direct, class 1 accuracy, lithium backup, C?)

Interfaces

• Infrared PACT port (this is a standard - possible adapter)
• Serial port ("for PC, modem or PACTLAN")

Software with support

• Principal (DOS) or Ease II (can't get this to run on XP due to .vbx; probably needs 2000; uses stopcopy protection) from PRI
• mv-rs, and possibly other Itron stuff
• Ziphany http://www.ziphany.com/Files/Supported_Meters.pdf

Resources

A later model, with a nice overview of available metrics.

Presumably ex-PRI consultant on Calmu meters

Serial protocol

1200bps ASCII, \r terminated

Equals symbols are shown on some variables, but presumably wouldn't fit for many. This seems to be consistent within each value, however.

'N', 's', 'u' or 'x' are slightly special/buggy. If a valid index isn't provided for 'N' or 'x', the meter returns '\xff' with no '\r', so take steps to prevent this. If a valid index isn't provided for 'u', 'U\r' is returned. 's' always seems to return the same value.

Lowercase commands are always inverted and smaller than uppercase, suggesting they're from another perspective. Obviously, units still increase, so 'u' probably just calls 'U', explaining its strange behaviour.

Sampling seems to be live, so sampling more frequently will be more accurate.

Commands

F	Frequency	"F=50.138\r"
R	(Real?) time. Where is date?	"R=15:00:40\r"
S	Serial number	"SP99A01869\r"
s	? related to 'B'?	"s=", dword 0xa605019e, dword 0, "\r"
B[AVWvw]	?	"BAA3123B" "BV182B85" "BW918D2F" "Bv05B6CE" "Bw01B525"
I[123]	Current	"I1+15.230" "I2+0.0000" "I3-0.0300"
i[123]	Current?	"i1-5.6300" "i2-0.0000" "i3-0.0100"
K[123AVW]	Instananeous power	"K1+2.0700" "K2+0.0000" "K3+0.0100" "KA+2.0600" "KV-1.3300" "KW+1.6300"
L[123]	Load?	"L1+9.0200" "L2+0.0100" "L3+0.0200"
P[123]	?	"P1+1.6400" "P2-0.0000" "P3+0.0000"
p[123]	?	"p1-1.3400" "p2+0.0000" "p3-0.0100"
Q[123A]	Power factor	"Q1=0.769-" "Q2=1.000+" "Q3=1.000+" "QA=0.787-"
U[AVWvw]	Units	"UA=2631984" "UV=0349470" "UW=2549220" "Uv=0177551" "Uw=0000001"
u[AVWvw]	Units (duplicate?)	"UA=2631986" "UV=0349470" "UW=2549221" "Uv=0177552" "Uw=0000001"
V[123]	Voltage	"V1+236.75" "V2+240.72" "V3+242.45"
	?