Operating Instructions 53
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203
- WNC-3Y-480-MB
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204
- WNC-3Y-600-MB
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205
- WNC-3D-240-MB
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206
- WNC-3D-400-MB
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207
- WNC-3D-480-MB
Version
(1708)
This reports the WattNode Modbus meter firmware version. The firmware is not field upgradable.
Options
(1709)
This register indicates factory configured options. For details, see
http://www.ccontrolsys.com/w/WattNode_Modbus_Option_Identification
.
PowerFailCount
(1711)
This counts (up to 32767) the number of times power has been cycled on this meter.
Communication Error Counts
The following four registers report communication error counts. Each register counts up to 32767
and stops. All four of these registers are reset to zero whenever power is cycled or by writing zero
to any of them.
CrcErrorCount
(1712)
This counts (up to 32767) the number of Modbus packets with an invalid CRC (cyclic redundancy
check).
FrameErrorCount
(1713)
This counts (up to 32767) the number of Modbus packets with framing errors. A framing error
can indicate bad baud rate, bad parity setting, RS-485 noise or interference, or an RS-485 bus
collision.
PacketErrorCount
(1714)
This counts (up to 32767) the number of Modbus packets that could not be parsed.
OverrunCount
(1715)
This counts (up to 32767) the number of times the Modbus input buffer has been overrun. The
buffer is 256 bytes and normal requests are less than 80 bytes, so an overrun normally indicates
non-Modbus traffic on the RS-485 bus or severe noise on the bus.
Error Codes
ErrorStatus
(1710)
ErrorStatus1 ‑ ErrorStatus8
(1716 - 1723)
The ErrorStatus registers hold queues of the most recent eight errors or status notifications.
ErrorStatus
allows access to the eight most recent errors from a single Modbus register. Each
time you read it, you’ll get another value (starting with the oldest). When there are no more
errors,
ErrorStatus
will report 0. The
ErrorStatus
values are preserved across power failures.
ErrorStatus
is generally best used with unattended data logging, since each error will only be
reported once.
ErrorStatus1
through
ErrorStatus8
also list the eight most recent errors, but with a few dif-
ferences.
ErrorStatus1
lists the most recent error or status, while
ErrorStatus8
lists the
oldest. Reading these
registers won’t change the reported values for
ErrorStatus1
through
