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  2. Samrello
  3. PID500-U

Samrello PID500-U Modbus register map

Universal PID process and temperature controller with RS485 Modbus RTU

  • Official
  • 168 registers
  • Modbus RTU
  • Revision 1 · 2026-11-11

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 defaults
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
140 holding registers, 8 input registers, 20 coils
Groups
9
Translation tables
19
Revision
1 · 2026-11-11
Added
()
File
maps/samrello/pid500-u.mbmap.json · 35 KB · history
SHA-256
22552e69fb6394e2322e1cfba415bf0698c427a9eeb3fe264259b9f694b575cd
Manufacturer
samrello.com.br

Sources and notes

  • PID500-U RS485 MODBUS Addresses · version 0.0, 2023-05
    Supplied with the map request

Source: Samrello, PID500-U RS485 MODBUS Addresses, version 0.0 (May 2023)

  • Addresses are the hexadecimal ones in the document (holding register 40032 is address 0x20 = 32, input register 30007 is address 7, coil 10 is address 0x0A), used as they are with address_base 0.
  • Functions: 0x01 coils, 0x04 input registers, 0x03 and 0x10 holding registers. The document marks the coils as read-only.
  • The document lists the setpoints, scaling, alarm and tuning parameters a second time as 32-bit floats at 400512 to 400780 (hex 0x200 to 0x30C). They are the same parameters and are not mapped here; the 16-bit and 32-bit integer set is used, with the decimal point set by the resolution register 130.
  • The integer values carry the decimals of the resolution setting; the document gives no fixed factor, so values are raw (except output percentage 0 to 1000 = 0 to 100 %).
  • Profile ramp time is 0000 to 9959 (hours and minutes as digits). Profile parameters follow the controller's 16-step profile.
  • The document gives no serial defaults (baud rate, parity, stop bits) or unit id.
AreaAddressNameTypeAccessUnitScaleDescription
CO 1 bool R 0 = °C, 1 = °F
CO 2 bool R 0 = no, 1 = yes
CO 4 bool R 0 = FD, 1 = RE
CO 5 bool R 0 = auto, 1 = manual
CO 6 bool R 0 = absolute, 1 = deviation
CO 7 bool R 0 = on, 1 = off
CO 8 bool R 0 = on, 1 = off
CO 9 bool R 0 = energize, 1 = de-energize
CO 10 bool R 0 = off, 1 = on
CO 12 bool R 0 = low, 1 = high
CO 13 bool R 0 = on, 1 = off
CO 14 bool R 0 = on, 1 = off
CO 15 bool R 0 = energize, 1 = de-energize
CO 16 bool R 0 = off, 1 = on
CO 17 bool R 0 = no, 1 = yes
CO 18 bool R 0 = no, 1 = yes
CO 19 bool R 0 = auto, 1 = manual
CO 20 bool R 0 = no, 1 = yes
CO 21 bool R 0 = level, 1 = online
CO 26 bool R 0 = all, 1 = zone
IR 1 int32 ABCD R
IR 3 int32 ABCD R
IR 5 int32 ABCD R % ×0.1 0 to 1000
IR 7 int32 ABCD R Decimals follow the resolution setting
IR 9 int32 ABCD R
IR 64 float32 ABCD R %
IR 66 float32 ABCD R
IR 68 float32 ABCD R
HR 32 int32 ABCD RW
HR 34 int32 ABCD RW
HR 36 int32 ABCD RW
HR 64 int16 RW
HR 65 uint16 RW
HR 66 int16 RW
HR 67 uint16 RW
HR 68 int16 RW
HR 69 int16 RW
HR 72 int16 RW
HR 73 int16 RW
HR 74 int16 RW
HR 75 int16 RW
HR 76 uint16 RW 0 to 400.0
HR 77 uint16 RW
HR 78 uint16 RW
HR 79 uint16 RW
HR 80 uint16 RW 0 to 3600
HR 81 uint16 RW
HR 82 uint16 RW
HR 83 uint16 RW
HR 84 uint16 RW 0 to 200
HR 85 uint16 RW
HR 86 uint16 RW
HR 87 uint16 RW
HR 88 uint16 RW
HR 89 uint16 RW
HR 90 uint16 RW
HR 91 int16 RW
HR 92 uint16 RW
HR 95 uint16 RW
HR 96 uint16 RW
HR 97 uint16 RW
HR 98 int16 RW
HR 99 int16 RW
HR 102 uint16 RW
HR 105 uint16 RW
HR 106 uint16 RW
HR 107 uint16 RW
HR 108 int16 RW
HR 111 uint16 RW
HR 128 uint16 RW
HR 129 uint16 RW
HR 130 uint16 RW TC/RTD: 0 = 1, 1 = 0.1; analog input: 0 = 1, 1 = 0.1, 2 = 0.01, 3 = 0.001
HR 133 uint16 RW
HR 134 uint16 RW 75 to 100
HR 135 int16 RW 0 to 100 (-100 to 100 in heat/cool mode)
HR 136 uint16 RW
HR 137 uint16 RW
HR 138 uint16 RW
HR 139 uint16 RW 0.5 to 5.0
HR 140 uint16 RW
HR 141 int16 RW
HR 144 uint16 RW
HR 145 uint16 RW
HR 146 int16 RW
HR 149 uint16 RW
HR 150 int16 RW
HR 153 uint16 RW
HR 154 uint16 RW
HR 155 uint16 RW Off or 0 to 100
HR 156 uint16 RW
HR 157 int16 RW 0 to 100 (-100 to 100 in heat/cool mode)
HR 158 uint16 RW 0 = off, 1 to 99
HR 159 uint16 RW 0 = off, 1 to 250
HR 160 uint16 RW 0.1 to 10.0 for TC/RTD
HR 163 uint16 RW
HR 164 uint16 RW
HR 165 uint16 RW
HR 166 uint16 RW
HR 167 uint16 RW
HR 168 uint16 RW

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