Appendix E: Modbus Registers Reference

This appendix provides the complete Modbus register map for the RPM-416 Data Logger.

Connection Information

• Protocol: Modbus TCP
• Default IP Address: 192.168.0.2
• Default Password: admin
• Maximum simultaneous connections: 5
• Connection timeout: 60 seconds (configurable)

Supported Functions

Function (hex)	Purpose	Remark
0x03	Reading of one or several registries	Maximum 125
0x06	Recording of one value in the register	—
0x10	Recording of one or several values in the registries	Maximum 123

Data Types

Notation	Description
UINT	16-bit unsigned integer
ULONG	32-bit unsigned integer (2 registers)
Address “N”	Single 16-bit value
Address “N-M”	Range of 16-bit values
Address “N:M”	32-bit value across two registers

Command Registry (Address 50)

Command Code	Description
0xF2C5	Data logger restart
0x77A6	Start recording
0x5606	Stop recording
0x5596	All errors reset
0x472C	Record settings in nonvolatile memory
0xD357	Load settings from nonvolatile memory
0x3010	Energy scalers reset (phase 1, channel 16)
0x3011	Energy scalers reset (phase 2, channel 17)
0x3012	Energy scalers reset (phase 3, channel 18)
0x3020	Pulse scalers reset (channel 12)
0x3021	Pulse scalers reset (channel 13)
0x3022	Pulse scalers reset (channel 14)
0x3023	Pulse scalers reset (channel 15)

Password Registry (Addresses 51-63)

To unlock write access to the data logger:

1. Write the correct password in ASCII symbols to registries 51-63
2. In unused registries, write zero values (0x0000)
3. Supported characters: A-Z, a-z, 0-9
4. Factory default password: “admin”

To block write access:

• Write any incorrect value (e.g., 0) to registries 51-63

System Registries

Address	Name	Type	Access	Description
0	Identifier	UINT	RD	Device identifier (value 14 for RPM-416)
1	Firmware version	UINT	RD	bit 15-8: major, bit 7-0: minor (e.g., 2.6)
2-7	MAC address	UINT×6	RD	MAC address bytes
8:9	State registry	ULONG	RD	See State Registry Bits below
10:11	Error registry	ULONG	RD	See Error Registry Bits below
12:13	Memory card capacity	ULONG	RD	Multiply by 512 for bytes
14:15	Free space	ULONG	RD	Multiply by 512 for bytes
16	File identifier	UINT	RD	Current file ID (0-9999)
17:18	File size	ULONG	RD	Current file size in bytes
19:20	Operation time	ULONG	RD	Seconds since power on
21:22	System time	ULONG	WR/RD	Seconds since 01.01.1980
23:24	Last event time	ULONG	RD	Seconds since 01.01.1980
25:26	Event counter	ULONG	RD	Events since power on

State Registry Bits (Address 8:9)

Bit	Description
0	0: no errors, 1: errors present
1	0: recording stopped, 1: recording started
3	0: no disc in slot, 1: disc present
4	0: card not initialized, 1: card initialized
5	0: FAT not ready, 1: FAT ready
6	0: file closed, 1: file open
7	0: recording finished, 1: recording in process
8	File deleting in process
9	File synchronization needed
10	Expansion module 1 connected
11	Expansion module 2 connected
12	Expansion module 3 connected
13	Expansion module 4 connected
14	Overvis connected

Error Registry Bits (Address 10:11)

Bit	Description
0	Real time clock failure
1	No access to AD converter
2	No access to MI
3	No access to MR
4	No access to RAM
5	No disc in card slot
6	Disc is write protected
7	Disc initialization impossible
8	Disc connection impossible
9	No free space on disc
10	Data reading from disc impossible
11	Directory cannot be created/opened
12	File name limit (9999) exceeded
13	Files list not available
14	File cannot be created
15	Recording to file impossible
16	Settings failure in flash memory
17	Settings cannot be saved to flash
18	Calibration failure in flash memory
19	Memory overflow

Base Channel Registers

Each channel has multiple measured values. The structure for each value is:

• Value type (UINT) - indicates the parameter type
• Value (ULONG) - the measured value

Parameter Types

Type	Name	Unit	Resolution
1	Voltage RMS	V	0.1
2	Voltage Instantaneous	V	0.1
3	Peak + voltage	V	0.1
4	Peak - voltage	V	0.1
5	Current RMS	A	0.01
6	Current Instantaneous	A	0.01
7	Peak + current	A	0.01
8	Peak - current	A	0.01
9	Frequency	Hz	0.01
10	THDr	%	1
11	Temperature	ºC	0.1
12	Analog voltage 0-10V	V	0.01
13	Analog current 0-20mA	mA	0.01
14	Digital input (ON/OFF)	—	1
15	Full power	VA	0.1
16	Active power	W	0.1
17	Reactive power	Var	0.1
18	Power factor (cos φ)	—	0.001
19	Active Energy Scaler	kW×h	0.1
20	Reactive Energy Scaler	kVAr×h	0.1
21	User’s Value	—	0.01
22	Pulse Frequency	Pulse×min	0.1
23	Pulse Scaler	—	1
24	Line voltage AB	V	0.1
25	Line voltage BC	V	0.1
26	Line voltage CA	V	0.1
27	Negative sequence voltage	V	0.1
28	Positive sequence voltage	V	0.1
29	Zero sequence voltage	V	0.1

Channel 1 - Voltage L1 (Addresses 100-117)

Value	Parameter	Type Address	Value Address
1	Voltage RMS L1	100	101:102
2	Voltage frequency L1	103	104:105
3	Voltage THDr L1	106	107:108
4	Peak + voltage L1	109	110:111
5	Peak - voltage L1	112	113:114
6	Instantaneous voltage L1	115	116:117

Channel 2 - Voltage L2 (Addresses 118-135)

Value	Parameter	Type Address	Value Address
1	Voltage RMS L2	118	119:120
2	Voltage frequency L2	121	122:123
3	Voltage THDr L2	124	125:126
4	Peak + voltage L2	127	128:129
5	Peak - voltage L2	130	131:132
6	Instantaneous voltage L2	133	134:135

Channel 3 - Voltage L3 (Addresses 136-153)

Value	Parameter	Type Address	Value Address
1	Voltage RMS L3	136	137:138
2	Voltage frequency L3	139	140:141
3	Voltage THDr L3	142	143:144
4	Peak + voltage L3	145	146:147
5	Peak - voltage L3	148	149:150
6	Instantaneous voltage L3	151	152:153

Channel 4 - Current L1 (Addresses 154-171)

Value	Parameter	Type Address	Value Address
1	Current RMS L1	154	155:156
2	Current frequency L1	157	158:159
3	Current THDr L1	160	161:162
4	Peak + current L1	163	164:165
5	Peak - current L1	166	167:168
6	Instantaneous current L1	169	170:171

Channel 5 - Current L2 (Addresses 172-189)

Value	Parameter	Type Address	Value Address
1	Current RMS L2	172	173:174
2	Current frequency L2	175	176:177
3	Current THDr L2	178	179:180
4	Peak + current L2	181	182:183
5	Peak - current L2	184	185:186
6	Instantaneous current L2	187	188:189

Channel 6 - Current L3 (Addresses 190-207)

Value	Parameter	Type Address	Value Address
1	Current RMS L3	190	191:192
2	Current frequency L3	193	194:195
3	Current THDr L3	196	197:198
4	Peak + current L3	199	200:201
5	Peak - current L3	202	203:204
6	Instantaneous current L3	205	206:207

Channel 7 - Current (Addresses 208-225)

Value	Parameter	Type Address	Value Address
1	Current RMS	208	209:210
2	Current frequency	211	212:213
3	Current THDr	214	215:216
4	Peak + current	217	218:219
5	Peak - current	220	221:222
6	Instantaneous current	223	224:225

Channel 8 - Temperature (Addresses 226-243)

Value	Parameter	Type Address	Value Address
1	Temperature	226	227:228
2-6	Reserved	229-243	—

Channel 9 - Temperature (Addresses 244-261)

Value	Parameter	Type Address	Value Address
1	Temperature	244	245:246
2-6	Reserved	247-261	—

Channel 10 - Analog Voltage 0-10V (Addresses 262-279)

Value	Parameter	Type Address	Value Address
1	Analog voltage 0-10V	262	263:264
2	User’s Value	265	266:267
3-6	Reserved	268-279	—

Channel 11 - Analog Current 0-20mA (Addresses 280-297)

Value	Parameter	Type Address	Value Address
1	Analog current 0-20mA	280	281:282
2	User’s Value	283	284:285
3-6	Reserved	286-297	—

Channels 12-15 - Digital Inputs (Addresses 298-369)

Each digital input channel has the following structure:

Value	Parameter	Description
1	Digital input	ON/OFF state
2	Pulse frequency	Pulses per minute
3	Pulse scaler	Accumulated pulses
4-6	Reserved	—

Channel 12: Addresses 298-315
Channel 13: Addresses 316-333
Channel 14: Addresses 334-351
Channel 15: Addresses 352-369

Channels 16-18 - Power (Calculated)

These channels do not have physical connections. Values are calculated from:

• Channel 16 = Channel 1 (Voltage L1) × Channel 4 (Current L1)
• Channel 17 = Channel 2 (Voltage L2) × Channel 5 (Current L2)
• Channel 18 = Channel 3 (Voltage L3) × Channel 6 (Current L3)

Each power channel has the following values:

Value	Parameter
1	Active power (W)
2	Reactive power (Var)
3	Full power (VA)
4	Power factor (cos φ)
5	Active Energy Scaler (kW×h)
6	Reactive Energy Scaler (kVAr×h)

Channel 19 - Line Voltages (Calculated)

This channel is calculated from Channels 1, 2, and 3:

Value	Parameter
1	Line voltage AB
2	Line voltage BC
3	Line voltage CA
4	Negative sequence voltage
5	Positive sequence voltage
6	Zero sequence voltage

Expansion Module Registers

Up to 4 expansion modules can be connected, providing additional channels 20-40.

The register addresses for expansion modules follow the same structure as base channels, starting from address 370.

Each expansion module can add up to 5 additional channels, depending on the module type.

Programmable Parameters

These registers allow configuration of the data logger via Modbus TCP.

Time and Sensor Settings

Name	Value Range	Default	Type	Address
Time correction, s/day	-99.9 … +99.9	0.0	INT	2000
Voltage sensor coefficient L1 (Ch. 1)	1.0 … 5000.0	1.0	UINT	2001
Voltage sensor coefficient L2 (Ch. 2)	1.0 … 5000.0	1.0	UINT	2002
Voltage sensor coefficient L3 (Ch. 3)	1.0 … 5000.0	1.0	UINT	2003
Nominal CT L1 (Ch. 4), A	5 … 9999	5	UINT	2004
Nominal CT L2 (Ch. 5), A	5 … 9999	5	UINT	2005
Nominal CT L3 (Ch. 6), A	5 … 9999	5	UINT	2006
Nominal CT (Ch. 7), A	5 … 9999	5	UINT	2007
Temperature correction (Ch. 8), ºС	-9.9 … +9.9	0.0	INT	2008
Temperature correction (Ch. 9), ºС	-9.9 … +9.9	0.0	INT	2009
Temperature sensor type (Ch. 8)	0…1	1	UINT	2010
Temperature sensor type (Ch. 9)	0…1	1	UINT	2011
Temperature filter (Ch. 8), s	0.0 … 10.0	1.5	UINT	2012
Temperature filter (Ch. 9), s	0.0 … 10.0	1.5	UINT	2013

Temperature sensor type: 0 = PTC1000, 1 = PT1000

Analog Input Settings

Name	Value Range	Default	Type	Address
Analog voltage sensor type (Ch. 10)	0…1	0	UINT	2014
Analog voltage sensor filter (Ch. 10), s	0.0 … 10.0	1.5	UINT	2015
Analog current sensor type (Ch. 11)	0…1	0	UINT	2016
Analog current sensor filter (Ch. 11), s	0.0 … 10.0	1.5	UINT	2017

Analog sensor type: 0 = Direct (0-10V or 0-20mA), 1 = Scale

Analog Voltage Scale (Channel 10)

Name	Value Range	Default	Type	Address
Input value, V, from	0.00 … 10.00	0.00	UINT	2214
Input value, V, to	0.00 … 10.00	10.00	UINT	2215
Output value, from	-999.9 … 0	0.0	INT	2216
Output value, to	0 … 999.9	10.0	INT	2217

Analog Current Scale (Channel 11)

Name	Value Range	Default	Type	Address
Input value, mA, from	0.00 … 20.00	0.00	UINT	2218
Input value, mA, to	0.00 … 20.00	20.00	UINT	2219
Output value, from	-999.9 … 0	0.0	INT	2220
Output value, to	0 … 999.9	20.0	INT	2221

Discrete Input Settings

Name	Value Range	Default	Type	Address
Discrete input type (Ch. 12)	0…1	0	UINT	2018
Discrete input type (Ch. 13)	0…1	0	UINT	2019
Discrete input type (Ch. 14)	0…1	0	UINT	2020
Discrete input type (Ch. 15)	0…1	0	UINT	2021
Digital signal capture (Ch. 12)	0…1	1	UINT	2206
Digital signal capture (Ch. 13)	0…1	1	UINT	2207
Digital signal capture (Ch. 14)	0…1	1	UINT	2208
Digital signal capture (Ch. 15)	0…1	1	UINT	2209

Discrete input type: 0 = Not inverted, 1 = Inverted

Digital signal capture: 0 = By fallout, 1 = By front

Event Settings

Each event (1-5) has the following parameters:

Name	Value Range	Default	Type	Addresses (Events 1-5)
Up limit mode	0…2	0	UINT	2022, 2023, 2024, 2025, 2026
Down limit mode	0…2	0	UINT	2027, 2028, 2029, 2030, 2031
Up limit value	—	0	LONG	2032:2033, 2034:2035, 2036:2037, 2038:2039, 2040:2041
Down limit value	—	0	LONG	2042:2043, 2044:2045, 2046:2047, 2048:2049, 2050:2051
Up limit time, ms	1ms…60s	10	UINT	2052, 2053, 2054, 2055, 2056
Down limit time, ms	1ms…60s	10	UINT	2057, 2058, 2059, 2060, 2061
Value source	—	4294967295	ULONG	2062:2063, 2064:2065, 2066:2067, 2068:2069, 2070:2071

Limit mode: 0 = Off, 1 = Momentary, 2 = Continued

Value source format (ULONG):

• bit 31-24: channel number (0-17)
• bit 23-16: value number (0-5)
• bit 15-0: value type (0-18)

Display Settings

Name	Value Range	Default	Type	Address
Display illuminating mode	0…2	2	UINT	2072

Display mode: 0 = Off, 1 = Always on, 2 = Off in 30 sec

Data Recording Settings

Name	Value Range	Default	Type	Address
Source of data to be written 1-20	—	4294967295	ULONG	2073:2074 to 2111:2112
Write period, ms	1ms…60m	1000	ULONG	2113:2114
File size, byte	32kB…512MB	32768	ULONG	2115:2116
Write type	0…1	0	UINT	2117
Write event	0…1	0	UINT	2118
Points before event	0…1920	100	UINT	2119
Points after event	0…1920	100	UINT	2120
Discreteness event writing, ms	1ms…1000ms	1	UINT	2121

Write type: 0 = Until memory, 1 = Ring buffer

Write event: 0 = Disabled, 1 = Enabled

Data source format (same as event value source).

Security Settings

Name	Value Range	Default	Type	Address
Password protection	0…1	0	UINT	2122
Access password (6 chars ASCII)	A-Z, a-z, 0-9	”1234”	STR	2123-2128

Password protection: 0 = Disabled, 1 = Enabled

Expansion Module Settings

Name	Value Range	Default	Type	Address
Expansion modules	0…1	0	UINT	2129
Type of module 1	0…1	0	UINT	2130
Type of module 2	0…1	0	UINT	2131
Type of module 3	0…1	0	UINT	2132
Type of module 4	0…1	0	UINT	2133

Expansion modules: 0 = Disabled, 1 = Enabled

Network Settings

Name	Value Range	Default	Type	Address
DHCP	0…1	0	UINT	2134
IP address	—	192.168.0.2	ULONG	2135:2136
Subnet mask	—	255.255.255.0	ULONG	2137:2138
Main gateway	—	192.168.0.1	ULONG	2139:2140
DNS server 1	—	192.168.0.1	ULONG	2141:2142
DNS server 2	—	8.8.8.8	ULONG	2143:2144

DHCP: 0 = Disabled, 1 = Enabled

Modbus TCP Settings

Name	Value Range	Default	Type	Address
Modbus TCP server	0…1	1	UINT	2145
Modbus TCP port	1…65535	502	UINT	2146
Modbus UID	0…255	0	UINT	2205
Modbus TCP timeout, s	60…3600	60	UINT	2147
Modbus password (13 chars ASCII)	A-Z, a-z, 0-9	”admin”	STR	2148-2160

Modbus TCP server: 0 = Disabled, 1 = Enabled

HTTP Server Settings

Name	Value Range	Default	Type	Address
HTTP server	0…1	1	UINT	2164
HTTP port	1…65535	80	UINT	2165
HTTP timeout, s	60…3600	300	UINT	2166
HTTP password (13 chars ASCII)	A-Z, a-z, 0-9	”admin”	STR	2167-2179

HTTP server: 0 = Disabled, 1 = Enabled

FTP Server Settings

Name	Value Range	Default	Type	Address
FTP server	0…1	0	UINT	2183
FTP port	1…65535	21	UINT	2184
FTP timeout, s	60…3600	300	UINT	2185
FTP password (13 chars ASCII)	A-Z, a-z, 0-9	”admin”	STR	2186-2198

FTP server: 0 = Disabled, 1 = Enabled

Overvis Client Settings

Name	Value Range	Default	Type	Address
Overvis client	0…1	0	UINT	2202
Overvis port	1…65535	20502	UINT	2203
Overvis timeout, s	60…3600	90	UINT	2204

Overvis client: 0 = Disabled, 1 = Enabled

Value Conversion

All values with decimal points are converted to integers. Use the resolution factor from the Parameter Types table to convert back to real values.

Example:

• Reading Voltage RMS returns 2301
• Resolution is 0.1
• Actual value = 2301 × 0.1 = 230.1 V

Example:

• Writing a power factor of 0.95
• Resolution is 0.001
• Value to write = 0.95 ÷ 0.001 = 950