Frequently Asked Questions
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Q. What is the minimum voltage for the optically isolation input to register a
logic high?
A. 5V, 10mA will be high enough to switch the LED of the opto-isolated input on.

Q. What is the maximum input voltage of the optically isolated inputs?
A. 28V, 50mA. The input isolation voltage for the opto-coupler is 2500V(rms).

Q. What are the maximum optical isolated channels of the µDAQ 62 and 69?
A. The µDAQ 62 can have up to 32 opto channels and the µDAQ 69 can have up to 16 opto channels.

Q. What is the maximum optical isolation voltage of the optically isolated inputs?
A. 2500V(rms)

Q. Does the µDAQ 62, 63, 69 have ordinary digital I/O as well?
A. All the µDAQ units have 24 (3 x 8) DIO channels as standard.

Q. What is the maximum output current of the normal digital I/O lines?
A. 2mA, TTL levels.

Q. What is the power rating of the reed relays?
A. 20W.

Q. What is the maximum current and voltage the reed relays can switch?
A. Maximum DC voltage of 200V or maximum DC current of 1 ampere.

Q. What type of connecter does the µDAQ use?
A. All µDAQ units only use a standard DB25-Male connector.

Q. What communication mediums does the µDAQ series support?
A. Serial RS232, RS485, as well as USB1.1, wireless, and soon to be released,
USB2 and Ethernet.

Q. Do I need a power supply for my µDAQ?
A. Yes, all the µDAQ units apart from the USB-24A and USB-72A are shipped with a power supply.

Q. How fast can I read my optical inputs and how fast can I switch my reed relays?
A. This depends on the communication mediums that you are using.
• USB1.1 will write to or read from a port within 3mSec.
• Serial and wireless will write to or read from a port as fast as 9mSec.

Q. What operating systems are supported by the µDAQ series?
A. Windows 98, ME, 2000, XP, and the latest Linux kernel version.

Q. Is there any documentation and examples available for the µDAQ series and what programming languages are supported?
A. We support most popular programming languages i.e. C, C++, Visual C++, Borland C builder, Delphi, Visual Basic, and Visual Studio .NET.


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