[collectd] Modbus plugin seems to read garbage values

[Gerry Demaret]

I've been playing with the modbus plugin to read the values from a
Schneider Electric PowerLogic EGX100. I'm using Debian testing which
has collectd 5.1.

First tries resulted in segmentation faults when I would enable the
modbus plugin. Some searches later, I found other people having the
same problem and ended up applying their patches to src/modbus.c.
Just in case, my modbus.c file can be found here:

  http://gerry.safehex.be/tmp/modbus.c-patch

I recompiled the package and it no longer segfaults, but it still
doesn't work properly.

The values in the rrd files seem to be completely wrong, it says I'm
using -17.9A and my power consumption is 9GWh. Since there isn't much
to configure in collectd, I don't know what the problem might be. Does
anyone have a pointer as to what I should look into?

This is the relevant part of my config:

LoadPlugin modbus

<Plugin modbus>
        <Data "current-phase1">
                RegisterBase 3000
                RegisterType float
                Type current
                Instance "phase1"
        </Data>

        <Data "current-phase2">
                RegisterBase 3002
                RegisterType float
                Type current
                Instance "phase2"
        </Data>

        <Data "current-phase3">
                RegisterBase 3004
                RegisterType float
                Type current
                Instance "phase3"
        </Data>

        <Data "voltage-l1">
                RegisterBase 3028
                RegisterType float
                Type voltage
                Instance "voltagel1"
        </Data>

        <Data "voltage-l2">
                RegisterBase 3030
                RegisterType float
                Type voltage
                Instance "voltagel2"
        </Data>

        <Data "voltage-l3">
                RegisterBase 3032
                RegisterType float
                Type voltage
                Instance "voltagel3"
        </Data>

        <Data "power-totalactive">
                RegisterBase 3060
                RegisterType float
                Type power
                Instance "totalactive"
        </Data>

        <Data "power-totalreactive">
                RegisterBase 3068
                RegisterType float
                Type power
                Instance "totalreactive"
        </Data>

        <Data "power-totalapparent">
                RegisterBase 3076
                RegisterType float
                Type power
                Instance "totalapparent"
        </Data>

        <Host "hq.tigron.net">
                Address "10.2.0.99"
                Port "502"
                Interval 10

                <Slave 2>
                        Collect "frequency"
                        Collect "current-phase1"
                        Collect "current-phase2"
                        Collect "current-phase3"
                        Collect "voltage-l1"
                        Collect "voltage-l2"
                        Collect "voltage-l3"
                        Collect "power-totalactive"
                        Collect "power-totalreactive"
                        Collect "power-totalapparent"
                </Slave>
        </Host>
</Plugin>

Thanks,

Gerry.

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