API Function Execution Speed (Basic Digital I/O Functions)

This data is a measurement of the average execution time* of basic I/O functions provided by Contec’s Windows and Linux drivers using representative products selected from the digital I/O devices of PC-based measurement and control series, PC-HELPER. In addition, measurement values are based on actual measurements performed in the operating environment prepared by Contec. Execution times will vary depending on the hardware and software configuration. Measurement is possible using the provided utility app (execution time measurement tool) for some functions provided by the API-DIO (WDM) Windows driver.
*Because function execution times vary based on OS task scheduling, the average execution time per function is calculated from 10,000 executed functions during average execution time measurement.

Measurement Condition

Measurement condition (1)：x86_64 / Windows

Measurement condition (2)：x86_64 / Linux

Measurement condition (3)：Raspberry Pi 4 / Linux

Measurement condition (4)：Jetson Nano Edge AI Computer / Linux

Measurement Result

Use function [1byte unit digital input]

OS	Driver	API
Windows	API-DIO(WDM)	DioInpByte
Linux	API-DIO(LNX)	DioInpByte

　　　　 　　　　 　　　　 　　　　 　　　　 　　　 　　　　 　　　　 　　　　 　　　 　　　　 　　　　 　　　　 　　　　 　　　　 　　　　 　　　　 　　　 　　　　 　　　　 　　　　 　　　 　　　　 　　　　 　　　　 　　　

Bus	Device		condition(1)	condition(2)	condition(3)	condition(4)
USB		DIO-1616LN-USB	125.0[µsec]	97.2[µsec]	108.0[µsec]	141.3[µsec]
		DIO-0808LY-USB	165.7[µsec]	151.9[µsec]	197.6[µsec]	226.7[µsec]
PCI Experss		DIO-1616L-PE	3.1[µsec]	3.5[µsec]	-	4.2[µsec]
Ethernet		DIO-1616LN-ETH	1.5[msec]	1.5[msec]	1.5[msec]	2.2[msec]
		CPSN-MCB271-S1-041 + CPSN-DI-08L	3.6[msec]	3.9[msec]	3.6[msec]	5.6[msec]
Wireless I/O		GW1-ETH-WQ + DIO-0404LY-WQ	2.3[msec]	1.7[msec]	2.2[msec]	2.7[msec]

Used function [1byte unit digital output]

OS	Driver	API
Windows	API-DIO(WDM)	DioOutByte
Linux	API-DIO(LNX)	DioOutByte

　　　　 　　　　 　　　　 　　　　 　　　　 　　　 　　　　 　　　　 　　　　 　　　 　　　　 　　　　 　　　　 　　　　 　　　　 　　　　 　　　　 　　　 　　　　 　　　　 　　　　 　　　 　　　　 　　　　 　　　　 　　

Bus	Device		condition(1)	condition(2)	condition(3)	condition(4)
USB		DIO-1616LN-USB	125.0[µsec]	115.8[µsec]	112.8[µsec]	147.5[µsec]
		DIO-0808LY-USB	165.6[µsec]	127.6[µsec]	187.5[µsec]	209.9[µsec]
PCI Experss		DIO-1616L-PE	3.1[µsec]	3.5[µsec]	-	4.6[µsec]
Ethernet		DIO-1616LN-ETH	2.5[msec]	2.4[msec]	2.2[msec]	3.3[msec]
		CPSN-MCB271-S1-041 + CPSN-DI-08L	3.8[msec]	4.1[msec]	3.9[msec]	5.6[msec]
Wireless I/O		GW1-ETH-WQ + DIO-0404LY-WQ	250.6[msec]	248.3[msec]	246.9[msec]	246.4[msec]

*Output function processing is completed when data to be output is set to the device. As such, for devices with slow response times that use opto-coupler isolation, function processing will finish before the device output status changes. Repeatedly calling functions will overwrite the output status, which could put the external signal in an unintended state.

Used function [1byte unit digital input：refer to Slave unit input data ]

OS	Driver	API
Windows	API-DIO(WDM)	DioInpByte
Linux	API-DIO(LNX)	DioInpByte

　　　　 　　　　 　　　　 　　　　 　　　　
Slave unit input data  　

Wireless I/O products use one of two digital input methods. 　　　
(1) Input data is obtained from master units, which periodically obtain input data from slave units. 　　　
(2) The latest input data is obtained from slave units. 　
This data has been acquired using method (2). Although this method takes longer than method (1), data can be obtained in real-time. However, with 1-byte digital input, data will be obtained by method (1).

Bus	Device		condition(1)	condition(2)	condition(3)	condition(4)
Wireless I/O		GW1-ETH-WQ + DIO-0404LY-WQ	120.9[msec]	119.5[msec]	121.1[msec]	121.6[msec]