Pixsys Controller Replacement Comparison

ATR121 → ATR124 Replacement Guide
3 Digit Temperature Controller

View ATR121 Details

Compact Modbus PID Controller

View ATR124 Replacement

Replaced: ATR121 Series
  • ATR121-AD: 1 analog input, 2 relays, 1 SSR, 12–24 Vdc
  • ATR121-B: 1 analog input, 2 relays, 1 SSR, 230 Vac

Display: 3-digit LED (red)

Output: Relay control + Solid state

Communication: None

Replacement: ATR124 Series
  • ATR124-AD: 1 analog input, 2 relays, 1 SSR, 12–24 V AC/DC
  • ATR124-ABC: 1 analog input, 2 relays, 1 SSR, 24–230 V AC/DC
  • ATR124-AD-T: 1 analog input, 1 SSR input, 1 relay, 12–24 V AC/DC, Modbus
  • ATR124-ABC-T: 1 analog input, 1 SSR input, 1 relay, 24–230 V AC/DC, Modbus

Display: 3-digit White LED (brighter)

Programming: Front keys + RFID/NFC via smartphone

Communication: Optional Modbus RS485

ATR141 → ATR144 Replacement Guide
4 Digit Temperature Controller

View ATR141 Details

Modbus Enabled Panel Meter

View ATR144 Replacement

Replaced: ATR141 Series
  • ATR141-AD: 12–24 Vac / 12–35 Vdc, 1 AI, 2 Relays, 1 SSR
  • ATR141-A: 24 Vac, 1 AI, 2 Relays, 1 SSR
  • ATR141-B: 230 Vac, 1 AI, 2 Relays, 1 SSR
  • ATR141-C: 115 Vac, 1 AI, 2 Relays, 1 SSR
  • ATR141-ADT: 12–35 Vdc, 1 AI, 1 Relay, 1 SSR, +Modbus RS485

Display: 4-digit LED (red)

Programming: Front keypad

Communication: Optional Modbus RS485 (T versions)

Replacement: ATR144 Series
  • ATR144-AD: 1 analog input, 2 relays, 1 SSR, 12–24 V AC/DC
  • ATR144-ABC: 1 analog input, 2 relays, 1 SSR, 24–230 V AC/DC
  • ATR144-AD-T: 1 analog input, 1 SSR input, 1 relay, 12–24 V AC/DC, Modbus
  • ATR144-ABC-T: 1 analog input, 1 SSR input, 1 relay, 24–230 V AC/DC, Modbus

Display: 4-digit White LED (high visibility)

Programming: Front keypad + NFC (smartphone)

Functionality: Same I/O, enhanced power range, built-in Modbus

ATR142 → ATR144 Replacement Guide
Ramp Soak Temperature Controller

View ATR142 Details

Modbus Enabled Panel Meter

View ATR144 Replacement

Replaced: ATR141 / ATR142 Series
  • ATR142-ABC: 24–230 Vac/DC, 1 AI, 2 Relays, 1 SSR
  • ATR142-ABC-T: 24–230 Vac/DC, 1 AI, 1 Relay, 1 SSR, +Modbus RS485

Display: 4-digit LED (red)

Programming: Front keypad

Communication: Optional Modbus RS485 (T versions)

Replacement: ATR144 Series
  • ATR144-AD: 1 analog input, 2 relays, 1 SSR, 12–24 V AC/DC
  • ATR144-ABC: 1 analog input, 2 relays, 1 SSR, 24–230 V AC/DC
  • ATR144-AD-T: 1 analog input, 1 SSR input, 1 relay, 12–24 V AC/DC, Modbus
  • ATR144-ABC-T: 1 analog input, 1 SSR input, 1 relay, 24–230 V AC/DC, Modbus

Display: 4-digit White LED (high visibility)

Programming: Front keypad + NFC (smartphone)

Functionality: Same I/O, enhanced power range, built-in Modbus

ATR243 → ATR244 Replacement Guide
4-20mA Controller with Modbus

View ATR243 Details

Modbus Temperature Controller

View ATR244 Replacement

Replaced: ATR243 Series
  • ATR243-20ABC: 2 relays 5 A or 1 relay + 1 SSR/V/mA
  • ATR243-21ABC-T: 2 relays + 1 SSR/V/mA + RS485 + CT
  • ATR243-31ABC: 3 relays + 1 SSR/V/mA + CT

Power Supply: 24–230 VAC/DC

Outputs: Relays, SSR, Analog (V/mA)

Communication: RS485 (T models only)

Replacement: ATR244 Series
  • ATR244-12ABC: 1 AI + 2 relays (2 A) + 2 SSR + 2 DI + 1 AO V/mA
  • ATR244-12ABC-T: as above + RS485
  • ATR244-13ABC: 1 AI + 3 relays (2 A) + 2 SSR + 2 DI + 1 AO V/mA
  • ATR244-23A-T: 2 AI + 3 relays + 2 SSR + 2–4 DI + 2 AO + RS485 + CT (24 VAC/VDC)
  • ATR244-23BC-T: as above (115–230 VAC)

Power Supply: 24–230 VAC/DC or 115–230 VAC models

Outputs: Relays, SSR, Dual Analog (V/mA)

Communication: Modbus RS485 standard on T models

DRR245 → DRR244 Replacement Guide
DIN Rail Temperature Controller

View DRR245 Details

PID Controller DIN Rail Mount

View DRR244 Replacement

Replaced: DRR245 Series
  • 1 Analog input, 2 relay 1 SSR or Analog output
  • Power supply: 24–230 Vac/Vdc
  • Modbus RTU over RS485

Control: PID control

Mounting: DIN rail

Configuration: Key pad

Replacement: DRR244 Series
  • 1 Analog input, 3 Relay 2 SSR 2 Digital Inputs Analog output)
  • Power supply: 24–230 Vac/Vdc
  • Modbus RTU over RS485

Control: PID control

Mounting: DIN rail

Configuration: Key pad, Cell Phone

ATR401 → ATR444 Replacement Guide
Dual Temperature Controller

View ATR401 Details

Dual PID Controller

View ATR444 Replacement

Replaced: ATR401 Series
  • ATR401-22ABC: 2 AI + 2 Relays 8 A + 1 SSR + D.I.
  • ATR401-23ABC: 2 AI + 3 Relays 8 A + 1 SSR + D.I.
  • ATR401-24ABC: 2 AI + 4 Relays 8 A + 1 SSR + D.I.
  • ATR401-22ABC-T: 2 AI + 2 Relays 8 A + 1 SSR + AO + RS485
  • ATR401-22ABC-D: 2 AI + 2 Relays 8 A + 1 SSR + AO + D.I.

Display: 2-line LED (red)

Outputs: Relays, SSR, Analog V/mA

Communication: Optional Modbus RS485

Replacement: ATR444 Series
  • ATR464-15ABC: 1 AI + 5 Relays 5 A + 2 SSR + 4 D.I. + 1 CT
  • ATR464-24ABC-T: 2 AI + 4 Relays 5 A + 2 SSR + 4 D.I. + 2 AO V/mA + 1 CT + RS485

Display:  Larger white dual-line LED

Outputs: Relays, SSR, Analog V/mA, CT Input

Communication: Modbus RS485 (on -T models), NFC setup

Configuration: Key pad, Cell Phone

ATR621 → ATR264 Replacement Guide
Programmable Process Controller

View ATR621 Details

Cycle Temperature Controller

View ATR264 Replacement

Replaced: ATR621 Series
  • ATR621-12ABC: 1 AI + 2 Relays 8 A + 1 SSR + D.I.
  • ATR621-14ABC: 1 AI + 3 Relays 8 A + 1 Relay 5 A (30V) + D.I.
  • ATR621-13ABC-T: 1 AI + 3 Relays 8 A + 1 AO V/mA/SSR + RS485

Cycle Control: Up to 20 steps

Display: Dual-line LED (red)

Programming: Front keypad or PC

Communication: RS485 Modbus (T models only)

Replacement: ATR264 Series
  • ATR264-12ABC-T: 1 AI + 2 Relays 2 A + 2 SSR/D.I. + 1 AO V/mA + RS485
  • ATR264-13ABC: 1 AI + 3 Relays 2 A + 2 SSR + 2 D.I. + 1 AO V/mA + 1 CT (Not UL tested)

Cycle Control: 15 profiles × 30 steps

Display: White dual-line LED

Programming: Front keypad + NFC smartphone

Communication: RS485 Modbus standard on -T models

ATR421 → ATR464 Replacement Guide
Multi Cycle Temperature Controller

View ATR421 Details

Advanced Temperature Profile Controller

View ATR464 Replacement

Replaced: ATR421 Series
  • ATR421-14ABC: 1 AI + 4 Relays 8 A + 1 SSR + D.I.
  • ATR421-12ABC-T: 1 AI + 2 Relays 8 A + 1 SSR + 1 AO V/mA + RS485

Function: Multi-cycle temperature control

Display: Dual-line LED

Communication: Modbus RS485 on -T models

Replacement: ATR464 Series
  • ATR464-15ABC: 1 AI + 5 Relays 5 A + 2 SSR + 4 D.I. + 1 CT
  • ATR464-24ABC-T: 2 AI + 4 Relays 5 A + 2 SSR + 4 D.I. + 2 AO V/mA + 1 CT + RS485

Function: Advanced cycle/profile controller

Display: White dual-line LED

Communication: RS485 (T models) + NFC setup

Frequently Asked Questions

The Compact Modbus PID Controller ATR124 replaced the ATR121 with enhanced power range, NFC setup, and optional Modbus RS485.

The Modbus Enabled Panel Meter ATR144 replaced both ATR141 and ATR142 with white LED display and built-in Modbus RTU support.

The Modbus Temperature Controller ATR244 replaced the ATR243, offering expanded I/O, dual analog outputs, and CT input on select models.

The PID Controller DIN Rail Mount DRR244 is the replacement for the DRR245, adding NFC configuration and additional digital inputs.

The Dual PID Controller ATR444 replaced the ATR401 with enhanced relay outputs, dual analog inputs, and Modbus communication.

The Cycle Temperature Controller ATR264 replaced the ATR621, supporting 15 profiles with up to 30 steps each and NFC smartphone setup.

The Advanced Temperature Profile Controller ATR464 replaced the ATR421, with additional relays, digital inputs, and current transformer input.

Yes, most of the new Pixsys controllers such as the ATR124, ATR144, ATR244, ATR264, and ATR444 offer Modbus RTU RS485 on "-T" models.

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