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  3. C702

Contemp C702 Modbus register map

Temperature controller: process value, setpoints, control output, alarms, ramp and soak programs, input and communication settings, and option readings

  • Official
  • 121 registers
  • Modbus RTU
  • Revision 1 · 2026-11-10
  • Identity: 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 8N1 · 9600 baud, 8 data bits, none parity, 1 stop bit
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
1-based · wire address = address − 1

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

Map

Registers
121 holding registers
Groups
12
Translation tables
3
Revision
1 · 2026-11-10
Firmware
Manual version 1.07, revision 9
Added
()
File
maps/contemp/c702.mbmap.json · 26 KB · history
SHA-256
918cef372cd63dfe7603e945b0017ab674adb24ec189008f12e4ee8ccf5ab55a
Manufacturer
contemp.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 Firmware version holding 125 uint16

Sources and notes

  • Manual de Instruções - Controlador de Temperatura C702 · version 1.07 rev. 9
    chapter 8 register tables and chapter 15 options; attached to issue #125 as c702v1.07rev.09.pdf

Source: Contemp, Manual de Instruções, Controlador de Temperatura mod. C702, versão 1.07 / revisão 9

  • Modbus RTU slave on RS-485. Registers are numbered from 1, as in the document. FC03 and FC04 read, FC06 and FC16 write; the on/off parameters can also be read and written as coils (FC01, FC02, FC05, FC15). The registers are mapped as holding registers here.
  • Baud rate 9600, 19200, 38400 or 57600 bit/s, 8 data bits, 1 or 2 stop bits, parity off, odd or even (register 123). The document gives no factory default for the address, baud rate or parity; 9600 8N1 and address 1 are assumed here.
  • Values marked u.e. in the document are whole numbers in engineering units, with the decimal places set in register 63 (1234 with one decimal place is 123.4). Values marked x10 are tenths.
  • The ramp and soak program segments (registers 250 to 1227), the write-only calibration commands (220 to 227, 232 to 237), the output calibration (238 to 243) and the 16-character tag (registers 126 to 141, one character each) are left out. Several registers are only meaningful when the matching option is fitted.
  • Written from the manual; this map has not been tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 1 int16 R In engineering units, with the decimal places set in register 63
HR 2 int16 RW In engineering units, with the decimal places set in register 63
HR 3 int16 RW % ×0.1 Output C1 (0 to 100 %) or C1+C2 (-100 to 100 %); writable in manual mode
HR 4 int16 RW In engineering units, with the decimal places set in register 63; auxiliary input (PV2)
HR 5 int16 RW In engineering units, with the decimal places set in register 63
HR 6 uint16 RW
HR 7 uint16 RW
HR 8 uint16 RW
HR 9 int16 RW In engineering units, with the decimal places set in register 63; -100.0 to 100.0 for a deviation alarm
HR 10 int16 RW In engineering units, with the decimal places set in register 63; -100.0 to 100.0 for a deviation alarm
HR 11 int16 RW In engineering units, with the decimal places set in register 63; -100.0 to 100.0 for a deviation alarm
HR 12 int16 RW In engineering units, with the decimal places set in register 63; -100.0 to 100.0 for a deviation alarm
HR 13 int16 R In engineering units, with the decimal places set in register 63
HR 14 int16 R In engineering units, with the decimal places set in register 63
HR 15 int16 R In engineering units, with the decimal places set in register 63
HR 16 int16 R In engineering units, with the decimal places set in register 63
HR 17 int16 R In engineering units, with the decimal places set in register 63
HR 18 int16 R In engineering units, with the decimal places set in register 63
HR 19 int16 R In engineering units, with the decimal places set in register 63
HR 20 int16 R In engineering units, with the decimal places set in register 63
HR 21 bool bit 0 R
HR 21 bool bit 1 R
HR 21 bool bit 2 R
HR 21 bool bit 3 R
HR 22 uint16 R Digital input option
HR 23 uint16 R Digital input option
HR 24 uint16 R Remote setpoint option
HR 25 uint16 R A ×0.1 Heater break option, 0 to 50.0 A
HR 26 uint16 R Heater break option
HR 27 uint16 R
HR 28 uint16 R The document lists 1 as uuuu and 2 as nnnn
HR 29 uint16 R Option fitted, as an ASCII code: 0 none, B dual digital input, C auxiliary supply, D auxiliary alarms, E linear output, F remote setpoint, G servo motor control, H auxiliary relay, I auxiliary pulse, J heater break. How 'none' is encoded is not stated
HR 30 uint16 R Option fitted, as an ASCII code; same letters as option 1
HR 31 uint16 RW
HR 40 uint16 RW
HR 41 uint16 RW 101 = continuous
HR 42 uint16 RW Segment running
HR 43 uint16 RW min
HR 44 uint16 RW
HR 45 uint16 R
HR 46 bool bit 6 R Bit 6: 0 running, 1 finished
HR 50 uint16 RW
HR 51 uint16 RW The document gives 2 as on.L
HR 52 uint16 RW
HR 53 uint16 RW 0 = off. In engineering units, with the decimal places set in register 63
HR 54 uint16 RW s 0 = off
HR 55 uint16 RW s 0 = off
HR 56 uint16 RW % ×0.1
HR 57 uint16 RW In engineering units, with the decimal places set in register 63
HR 58 uint16 RW ×0.1
HR 59 int16 RW In engineering units, with the decimal places set in register 63
HR 60 uint16 RW
HR 61 uint16 RW
HR 62 uint16 RW
HR 63 uint16 RW
HR 64 int16 RW
HR 65 int16 RW
HR 66 uint16 RW s 0 = off
HR 67 int16 RW In engineering units, with the decimal places set in register 63
HR 68 uint16 RW
HR 69 uint16 RW Raw code; the meaning depends on the output type fitted (relay, linear or pulse): 0 off, 1 C1, 2 C2, 3 A1 or PV, 4 A2 or SP. See the document's table
HR 70 uint16 RW 0 = 0-20 mA, 1 = 4-20 mA, 2 = pulse (for the outputs that allow it)
HR 71 uint16 RW Raw code; the meaning depends on the output type fitted (relay, linear or pulse): 0 off, 1 C1, 2 C2, 3 A1 or PV, 4 A2 or SP. See the document's table
HR 72 uint16 RW 0 = 0-20 mA, 1 = 4-20 mA, 2 = pulse (for the outputs that allow it)
HR 73 uint16 RW Depends on the option fitted: modulating control 0 off or 1 on; auxiliary relay or pulse 0 off, 1 C1, 2 C2; auxiliary alarms 0 off, 1 A3/A4; linear 0 off, 1 PV, 2 SP, 3 C1, 4 C2; heater break 0 off, 1 on
HR 74 uint16 RW 0 = 0-20 mA, 1 = 4-20 mA, 2 = pulse (for the outputs that allow it)
HR 75 uint16 RW
HR 76 uint16 RW The document names the modes oFF, EvEr, P.uP and bAnd
HR 77 uint16 RW Seconds per 100 % of output
HR 78 uint16 RW s
HR 79 uint16 RW % ×0.1
HR 80 uint16 RW % ×0.1
HR 82 uint16 RW % ×0.1
HR 83 uint16 RW % ×0.1
HR 81 uint16 RW s
HR 84 uint16 RW
HR 85 uint16 RW
HR 86 int16 RW In engineering units, with the decimal places set in register 63; same value as the setpoint in the operation block
HR 87 uint16 RW In engineering units, with the decimal places set in register 63
HR 88 uint16 RW s 0 = off
HR 89 uint16 RW s 0 = off
HR 90 uint16 RW
HR 91 uint16 RW
HR 92 uint16 RW
HR 93 int16 RW In engineering units, with the decimal places set in register 63; same value as the setpoint in the operation block
HR 94 uint16 RW In engineering units, with the decimal places set in register 63
HR 95 uint16 RW s 0 = off
HR 96 uint16 RW s 0 = off
HR 97 uint16 RW
HR 98 uint16 RW
HR 99 uint16 RW
HR 100 int16 RW In engineering units, with the decimal places set in register 63; same value as the setpoint in the operation block
HR 101 uint16 RW In engineering units, with the decimal places set in register 63
HR 102 uint16 RW s 0 = off
HR 103 uint16 RW s 0 = off
HR 104 uint16 RW
HR 105 uint16 RW
HR 106 uint16 RW
HR 107 int16 RW In engineering units, with the decimal places set in register 63; same value as the setpoint in the operation block
HR 108 uint16 RW In engineering units, with the decimal places set in register 63

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