WattNode WNC-3Y-208-MB, Installation And Operation Manual

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6 Overview
General Options
●
Option CT=xxx - Pre-assign xxx as the global CtAmps value.
● Option CT=xxx/yyy/zzz - Pre-assign xxx to CtAmpsA , yyy to CtAmpsB , and zzz to
CtAmpsC .
Communication Options
●
Option EP - Factory configure the Modbus RS-485 communications to even parity (E81).
● Option 19K - Factory configure the RS-485 communications 19,200 baud. Position 8 of the
DIP switch will be ignored.
●
Option 38K - Factory configure the RS-485 communications to 38,400 baud. Position 8 of
the DIP switch will be ignored.
● Option TCP‑RTU - Configure the communications to the Modbus TCP-RTU protocol option
for use with RS-485 to Ethernet gateways (serial device adapters).
●
Option AD - Factory configure the Modbus address. The DIP switch address will be ignored.
X Terminal Options
These options utilize the
X
(auxiliary) terminal on the
MODBUS
connector. Only one of these can
be ordered on any single meter.
●
Option X5
- Provides 5 VDC at up to 60 milliamps between the
C
(common) and
X
(5V)
terminals.
●
Option IO - Provides a digital input (level sensing and pulse counting) or output (for load
shedding and other applications) on the
X
terminal.
●
Option SSR
- Provides a solid-state relay (contact closure) output between the
X
and
C
terminals for load shedding and other applications.
Special Options
Contact the factory about the following special options:
●
Option 232 - Provide RS-232 I/O in place of RS-485.
●
Option TTL
- Provide 5V TTL UART I/O in place of RS-485.
Current Transformers
The WattNode meter uses solid-core (toroidal), split-core (opening), and bus-bar current trans-
formers (CTs) with a full-scale voltage output of 0.333 Vac. Split-core and bus-bar CTs are easier
to install without disconnecting the circuit being measured. Solid-core CTs are more compact,
generally more accurate, and less expensive, but installation requires that the measured circuit be
disconnected.
Additional Literature
These additional documents are available on the Continental Control Systems, LLC website or
Modbus.org website.
●
WattNode Modbus - Quick Install Guide
● WattNode Modbus Register List (Excel format): WNC-Modbus-Register-List-V16.xls
●
Continental Control Systems, LLC website
○ http://www.ccontrolsys.com/w/WattNode_Modbus - main page.
○
http://www.ccontrolsys.com/w/Category:WattNode_Modbus - support articles.
● http://www.modbus.org/specs.php
○
Modbus Application Protocol Specification - V1.1b
○ Modbus over Serial Line - Specification & Implementation Guide - V1.0