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Basic Questions

The following is a list of frequently asked questions about HLS and CUnet.
Please read the following FAQs before contacting us about products and technologies.

List of Basic Questions


We do not have the expertise to design LSI chips, but we want to streamline the current system using HLS.
Various products including remote I/O module using HLS are provided by sales agents.
Consult them as necessary. Combining those products will give you a solution on how to streamline your current system.
For the sales agents, click Partners & Modules.
How can I get detailed information on the recommended pulse transformer and cable?
Those recommended parts are not our products.
However, you can get them when you purchase HLS.
For information on the parts, contact each manufacturer or HLS distributor, or click Recommended Parts.

- Pulse transformer:
Contact: Pionics Co., Ltd. 042-566-1231
- Cable:
Contact: Shinko Seisen Industry Co., Ltd. 044-777-7000
What kind of system is HLS (Hi-speed Link System)?
It is a serial communication system designed to save wiring for remote I/O.

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What is the difference between HLS and Ethernet, etc.?
And, how is HLS different from Ethernet, etc?
LAN network including Ethernet transfers relatively large data.
In addition, Ethernet uses the CSMA/CD, which does not guarantee that the sent data reaches the destination.
HLS transfers only I/O data, which simplifies and speeds up the protocol.
HLS also uses the polling method to assure realtimeness required for control.
What does "communication rate of 1ms" mean?
"1ms" means 1/1000 second. "Communication rate of 1ms" means a response can be made to the input in such a short time.
(It is said that the sound travels through the air about 300m per second, and so even the sound travels only about 30cm per ms.) 2016 I/O points (1008 input and output, respectively) handle a large number of I/O points.
I am worrying about the communication reliability for serial communication.
HLS performs three certifications such as RZ sign test, packet format test, and CRC12 test concurrently to ensure data reliability.
Packets where error was detected are discarded, and so the user never receives incorrect data.
I am worrying about the noise of the factory where arc welding is performed.
Can we use HLS in such a field site?
We have experimental data for using the recommended transmission path.
However it is best to test HLS in that actual field to evaluate whether HLS can be used in a certain field.
HLS has a function to indicate the occurrence of communication error by pulse.
So, by checking the error occurrence rate in the actual field beforehand, you can determine whether you can use HLS.
Depending on application, if no "CHK2 pulse" indicating that three consecutive errors occurred appears, it gives an indication of whether you can use HLS.

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Tell me how to evaluate HLS.
We provide an evaluation kit (HLS-VS) so that you can try the HLS.
Using our center chip board that supports the ISA bus and PCI bus allows you to perform detailed verification of HLS.
The center board chip comes with Windows drivers and libraries, so you can easily verify HLS using a program on your development environment.
On the terminal side, you can use the MKY34 evaluation board, HLSB-TI/O.
However, note that you cannot use HLS-VS and HLSB-TI/O that have no protection circuits, for noise tests that might damage HLS.
What kind of LSI is MKY34?
MKY34 is a satellite device for HLS, and is a general-purpose model incorporating the I/O (16/16), counter, and serial input register. MKY34 performs I/O operation as a terminal, without CPU, by being controlled from the center device.

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What kind of LSI is MKY35?
MKY35 is a satellite device for HLS, and is a compact package model incorporating the I/O points (variable), counter, and simple PWM output function.
As with MKY34, MKY35 performs I/O operation as a terminal, without CPU, by being controlled from the center device.
Can I build a system where MKY34 and MKY35 coexist?
Yes, you can. There is no restrictions on physical location, address setting, etc.
If the total number of MKY34 and MKY35 is 63 (maximum number of satellites) or fewer, you can place them freely.

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