MBMap Registry
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  2. Novus
  3. N1500

Novus N1500 Modbus register map

Also covers N1500LC, N1500G

Universal process indicator with up to four alarms, analog retransmission and optional RS485 Modbus RTU: process value, min/max, status, alarms, input and retransmission settings, custom linearization

  • Official
  • 82 registers
  • Modbus RTU
  • Revision 1 · 2026-10-31
  • Identity: model, firmware

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

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Communication

Protocol
Modbus RTU
Unit ID
1
Serial
9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
0-based

Connection values are defaults: the device may be configured differently.

Map

Registers
78 holding registers, 4 coils
Groups
10
Translation tables
7
Revision
1 · 2026-10-31
Firmware
Communication manual for software V2.3x
Added
()
File
maps/novus/n1500.mbmap.json · 17 KB · history
SHA-256
6314bf3d11fa2c74130a31a410b7773643e3d83fe3b86adedd664ab82624d76c
Manufacturer
novus.com.br

Device identity

What a tool can read to check that this map fits the connected device (SPEC.md section 4.7). Registers with a role are read like any other register.

Registers
RoleRegisterAddressTypeValues
Firmware Software version holding 7 uint16
Model Equipment ID holding 8 uint16 3 = N1500

Sources and notes

Source: Novus N1500 / N1500LC / N1500G communication manual V2.3x D (Portuguese)

  • Modbus RTU needs the optional RS485 interface. Functions 03, 05 and 06; writes with address 0 are broadcast.
  • 8 data bits, 1 stop bit, no parity or even parity (chosen together with the baud rate in register 42). The manual does not give the factory address or baud rate: check the adres and bavd screens on the indicator.
  • Every register is a signed 16-bit value. Registers 12 and up can be read and written; most registers below 12 are read-only.
  • The process value, limits, alarm setpoints, offset and hysteresis are integers in the indicator's display unit, with the decimal places set in register 11 (dppos): 1234 with dppos = 1 is 123.4.
  • A write outside the allowed range is not refused: the indicator stores the maximum allowed value and returns it.
  • The F key and digital input function lists and the input type list differ on the LC model; the tables in this map are those of the standard model, and the LC values are in the register descriptions.
  • The custom linearization points (registers 61 to 90 for the input, 91 to 120 for the indication) are not listed.
  • Written from the manufacturer's manual; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 0 int16 R Decimal places set by Decimal point position (register 11)
HR 1 int16 R Lowest value since the last clear
HR 2 int16 R Highest value since the last clear
HR 3 uint16 R The manual gives a range of 0 to 120000, which does not fit one register; values above 65535 cannot be read here
HR 4 int16 R Value of the screen being shown; its range depends on the screen
HR 5 uint16 R
HR 6 bool bit 0 R
HR 6 bool bit 1 R
HR 6 bool bit 2 R
HR 6 bool bit 3 R
HR 6 bool bit 4 R
HR 6 bool bit 5 R
HR 6 bool bit 8 R
HR 6 bool bit 9 R
HR 6 bool bit 10 R
HR 6 bool bit 11 R
HR 6 bool bit 12 R
HR 9 bool bit 0 R
HR 9 bool bit 1 R
HR 9 bool bit 2 R
HR 9 bool bit 3 R
HR 9 bool bit 5 R
HR 9 bool bit 6 R
HR 9 bool bit 7 R
HR 9 bool bit 8 R
HR 9 bool bit 9 R
HR 9 bool bit 11 R
HR 9 bool bit 12 R
HR 9 bool bit 13 R
HR 9 bool bit 14 R
HR 9 bool bit 15 R
HR 10 uint16 W
CO 0 bool RW Coil 1 in the manual (00001). Can be written only when alarm 1 function is Off
CO 1 bool RW Coil 2 in the manual (00002). Can be written only when alarm 2 function is Off
CO 2 bool RW Coil 3 in the manual (00003). Can be written only when alarm 3 function is Off
CO 3 bool RW Coil 4 in the manual (00004). Can be written only when alarm 4 function is Off
HR 11 uint16 R dppos
HR 37 uint16 RW intyp. On the LC model: 0 = 0-20 mV, 1 = -20 to 20 mV, 2 = 0-50 mV, 3-5 = the same with custom linearization, 6 = 0-20 mA, 7 = 4-20 mA, 8-9 = the same with custom linearization
HR 38 uint16 RW vnit; not on the LC model
HR 39 int16 RW inlol
HR 40 int16 RW inkil
HR 14 uint16 RW filtr
HR 15 int16 RW ofset; between the indication limits
HR 16 uint16 RW scale
HR 17 uint16 RW s.root
HR 12 uint16 RW f.fvnc. On the LC model also 4 = High, 5 = Low, 6 = Zero
HR 13 uint16 RW dig.in. On the LC model also 4 = High, 5 = Low, 6 = Tare
HR 19 int16 RW al.ref; reference for the differential alarms, between the indication limits
HR 21 int16 RW sp.al1
HR 22 int16 RW sp.al2
HR 23 int16 RW sp.al3
HR 24 int16 RW sp.al4
HR 25 uint16 RW
HR 26 uint16 RW
HR 27 uint16 RW
HR 28 uint16 RW
HR 29 uint16 RW
HR 30 uint16 RW
HR 31 uint16 RW
HR 32 uint16 RW
HR 33 int16 RW ky.al1, in display units
HR 34 int16 RW ky.al2, in display units
HR 35 int16 RW ky.al3, in display units
HR 36 int16 RW ky.al4, in display units
HR 46 uint16 RW s
HR 47 uint16 RW s
HR 48 uint16 RW s
HR 49 uint16 RW s
HR 50 uint16 RW s
HR 51 uint16 RW s
HR 52 uint16 RW s
HR 53 uint16 RW s
HR 20 uint16 RW ovt.ty
HR 18 uint16 RW ovt.er; where the 4-20 mA output goes on an input error
HR 54 int16 RW ou.lol; indication that gives 4 mA (0 mA)
HR 55 int16 RW ou.kil; indication that gives 20 mA
HR 41 uint16 RW adres
HR 42 uint16 RW bavd
HR 7 uint16 R ×0.01 100 is V1.00
HR 8 uint16 R Other values are special versions
HR 43 uint16 R 0-9999; the serial number is this followed by the lower display part
HR 44 uint16 R 0-9999

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