Register Address Type Description
0 40001 Integer, 16 bit Volts RMS Phase A, MSB * 10
40002 Volts RMS Phase A, LSB 1234 = 123.4V
1 40003 Integer, 16 bit Current RMS Phase A, MSB *10
40004 Current RMS Phase A, LSB 1234=123.4A
2 40005 Integer, 16 bit Watts (active) PhaseA MSB (see table 2)
40006 Watts (active) PhaseA, LSB (see table 2)
3 40007 Integer, 16 bit Volts RMS Phase B, MSB * 10
40008 Volts RMS Phase B, LSB 1234 = 123.4V
4 40009 Integer, 16 bit Current RMS Phase B, MSB *10
40010 Current RMS Phase B, LSB 1234=123.4A
5 40011 Integer, 16 bit Watts (active) Phase B MSB (see table 2)
40012 Watts (active) Phase B, LSB (see table 2)
6 40013 Integer, 16 bit Volts RMS Phase C, MSB * 10
40014 Volts RMS Phase C, LSB 1234 = 123.4V
7 40015 Integer, 16 bit Current RMS Phase C, MSB *10
40016 Current RMS Phase C, LSB 1234=123.4A
8 40017 Integer, 16 bit Watts (active) Phase C MSB (see table 2)
40018 Watts (active) Phase C, LSB (see table 2)
9 40019 Integer, 16 bit Watts (active) sum MSB
40020 Watts (active) sum LSB
10 40021 Integer, 32 bit Energy (active) KWH, MSB (see Note 1)
40022 Energy (active) KWH, direct reading
11 40023 Integer, 32 bit Energy (active) KWH
40024 Energy (active) KWH, LSB
12 40025 Integer, 16 bit Power Factor, Phase A , zero
40026 Power Factor, Phase A ,(see Note 2)
13 40027 Integer, 16 bit Power Factor, Phase B , zero
40028 Power Factor, Phase B , (see Note 2)
14 40029 Integer, 16 bit Power Factor, Phase C , zero
40030 Power Factor, Phase C , (see Note 2)
Table 1 Register Map - Read Only
RC Range Multiply
data by
RC1 100
RC2 100
Table 2 Scaling For Watts
Data
About MODBUS and the Monitor (continued)
8 data bits, with the least significant bit sent first
1 bit for even parity
1 stop bit
Errors that occur during a query, such as parity or CRC,
will flash the FAULT LED and no response will be sent.
RTU Framing
In RTU mode, messages start with a silent interval of at
least 3.5 character times. This time is scaled to BAUD rate
with the BAUD selection switch.
The first field then transmitted is the device address. The
allowable characters transmitted for all fields are hexadeci-
mal 0 ... 9, A ... F. The Monitor monitors the network bus
continuously, including during the silent intervals. When
the first field (the address field) is
received, the Monitor decodes
it to find out if it matches the
address set on the switch. If there
is a match the following bytes
are collected. Following the last
transmitted character, a similar
interval of at least 3.5 character
times, marks the end of the mes-
sage. The Monitor will collect the
data and respond to the master. A
new message will begin after this
interval
Troubleshooting
1. No Data on LCD Display
Recheck that all connections are made properly, and the
power supply to the unit is energized. Recheck line volt-
age fuses to be sure they are conducting.
2. Negative Power Factor when monitoring an induc-
tive load.
One or more RC coils are reversed, either the marked
H1 side is not facing the power source or the output leads
are reversed. The white secondary lead must be connected
to the positive input terminal.
3. Power factor shows 0.01
A. This value is displayed if the frequency of the primary
circuit is out of bounds (lower than 48hZ when moni-
toring a 50hZ circuit or lower than 58hZ when moni-
toring a 60hZ circuit).
B. There may be no current in a phase or the monitored
circuit is not energized.
C. The power factor is lower than 0.10.
4. Modbus output is not being received at the Master
Check the slave (APN) network address setting to be
sure there are no conflicts with other network nodes. Also
recheck the baud rate settings to match the other equip-
ment.
Notes:
1. Energy is saved in two registers for a total of 4,294,967,295 kWHr. To combine the two registers,
multiply MSB by 65,536 and add to LSB
2. A power factor reading of 70 = +0.70 (inductive). A power factor reading of 198 = -0.70 (capaci-
tive). Because the MSB is set for negative, for readings greater than 128 subtract 128 from the reading
and change the sign to negative.
