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IO423: Synchro and Resolver I/O Module

A Synchro and Resolver I/O Module.

The IO423 is a 1- to 4-channel 16-bit Synchro/Resolver-To-Digital Converter offering a conversion accuracy of 2 arcmin + 1LSB.  
This I/O module supports Synchro and Resolver measurements in Simulink® with programmable resolutions of 10, 12, 14 or 16 bits. Signal conditioning adapters installed on the IO423 can adapt the Synchro/Resolver signal levels and configure the optional reference oscillator input/output. In addition, the module provides a 4 V velocity output to replace a tachometer. 
This I/O module is ideal for closed-loop controls and hardware-in-the-loop simulations using MATLAB® and Simulink. 

Key Feature

IO423-1 1 channel
IO423-2 2 channels
IO423-3 3 channels
IO423-4 4 channels
Form factor PMC
Power requirements Base Board: 2W, Signal Conditioning Adapter: 0.2W 
Bus PCI Rev. 2.2 compatible, 33 MHz/32-Bit, 3.3 V and 5V PCI Signaling Voltage compatible 
Connectors 68-way SCSI3
Operating temperature

40 °C to +85 °C 

Relative humidity

5 – 95 % non-condensing

RTD Converter  

Programmable 10, 12, 14 or 16 Bits 


2 arcmin + 1 LSB 

Additional output

Velocity output ±4 V with 0.75 % linearity

Signal Conditioning Adapter   
Reference output frequency 

1-10 kHz, factory selectable

Reference output voltage 

Max. 11.8 V/70 mA

Reference input frequency  Max. 10 kHz, resolution dependent 
Signal input voltage  Factory selectable 
Reference input voltage  Factory selectable 
I/O Access   

68-way SCSI3 

Mean time between failures (MTBF)* 

IO423-1: 464,000 hours  
IO423-2: 354,000 hours  
IO423-3: 286,000 hours  
IO423-4: 240,000 hours 

MTBF (Mean Time Between Failure) - *MTBF values shown are based on calculation according to MIL-HDBK-217F and MIL-HDBK-217F Notice 2. Environment GB 20 °C. The MTBF calculation is based on component FIT rates provided by the component suppliers. If FIT rates are not available, MIL-HDBK-217F and MIL-HDBK-217F Notice 2 formulas are used for the FIT rate calculation.
Item ID Product Name Components
  • 1x IO423 Synchro/Resolver I/O module with X channel(s) 
  • 1x 68-pin male SCSI3 to 68-pin male MDR Cable 
  • 1x 68-pin Female MDR Terminal Board 
  • Driver block library for Simulink Real-Time™ 
  • Installation into real-time target machine 
Signal Conditioning Adapter
2G423  IO423-SCA-A1-xx 
  • 1x IO423 Synchro/Resolver Signal Conditioning Adapter 
  • Installation into IO423 I/O module 
  • External reference 
2H423  IO423-SCA-A2-xx
  • 1x IO423 Synchro/Resolver Signal Conditioning Adapter with reference oscillator 
  • Installation into IO423 I/O module 
  • On-board reference oscillator 
2I423 IO423-SCA-A3-xx
  • 1x IO423 High-Precision Synchro/Resolver Signal Conditioning Adapter  
  • Installation into IO423 I/O module 
  • External reference 
  • High-precision resistors 
2J423  IO423-SCA-A4-xx
  • 1x IO423 High-Precision Synchro/Resolver Signal Conditioning Adapter with reference oscillator  
  • Installation into IO423 I/O module 
  • On-board reference oscillator 
  • High-precision resistors 

Pricing information
We don't publish pricing information on our website. Upon request by e-mail or phone we can provide a complete price list covering our entire product portfolio in various currencies. We recommend that you get in touch with us to discuss your specific needs. We can then quickly provide you with a tailored quotation including technical and pricing information.


Included in the Delivery

  • I/O module installed in the real-time target machine 
  • Cable
  • Terminal board
  • Simulink driver blocks 
  • Test models 
  • Comprehensive documentation 

Common Applications

Supported target machines


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