2-2
IM 701730-17E
2.2 USB Interface Functions and Specifications
2.2
USB Interface Functions and Specifications
Reception Function
You can specify the same settings as those specified by front panel key operations.
Receives output requests for measured and computed data, setting parameters of the
panel, and error codes.
Transmission Function
Outputs measured and computed data.
Outputs setting parameters of the panel and the status byte.
Outputs error codes that are generated.
USB Interface Specifications
Electrical and Mechanical Specifications: Conforms to USB Rev.1.0
Connector:
Type B connector (receptacle)
Number of Ports:
1
Power Supply:
Self-powered
Supported Systems:
PC system supported. Models with a
standard USB port that operates on Windows
98 SE, Windows Me, Windows 2000, or
Windows XP (a separate device driver is
required for connection to the PC).
Data Transfer Rate
The table below shows approximate response times for output of waveform data,
assuming the following configuration.
Model:
701730
Controller:
PC(Pentium4 1.3GHz, USB1.1), OS(Windows2000
Professional)
GB-IB Board:
NI AT-GPIB/TNT(PNP)
Programming Language:
Visual C++
Data Volume
Byte Format
Word Format
ASCII Format
1000
approx. 39.9 ms
approx. 40.0 ms
approx. 240.0 ms
10000
approx. 50.4 ms
approx. 82.7 ms
approx. 2.0 s
100000
approx. 250.8 ms
approx. 403.2 ms
approx. 20.0 s
1000000
approx. 2166.1 ms
approx. 3475.1 ms
approx. 204.6 s
Switching between Remote and Local Mode
When Switching from Local to Remote Mode
If the DL1720E/DL1740E/DL1740EL receives a
":COMMunicate:REMote ON"
command from the PC when it is in the local mode, it switches to the remote mode.
• REMOTE is displayed at the lower left corner of the screen.
• All keys except SHIFT+CLEAR TRACE are disabled.
• The settings that existed in the local mode are maintained even when the instrument
switches to the remote mode.
