7. BUS REMOTE INTERFACE GPIB/ USB/RS-232
This section provides information on the proper use and configuration of the bus
remote interface. The USB/RS-232 remote interface is standard on the 620L but the
GPIB (IEEE-488) interface option can be substituted for the USB/RS-232 interface.
Please refer to section 8.0. Options for details on the 620L options.
The USB/RS-232 interface card requires the user to download a driver in order for the
instrument to recognize the USB interface. The driver can be found on the Associated
Research, Inc. website:
http://www.asresearch.com/products/software/USB-driver.aspx
Click on “USB/RS-232 Driver” to download the driver. This link contains an automatic
extract and install program. Follow the instructions of the installation program to
initialize the driver install. NOTE: The USB port acts as a USB to RS-232 converter.
As a result, the PC will recognize the USB port as a virtual COM port.
The USB/RS-232 interface uses the same command set as the GPIB interface for
setting test parameters; however, many functions of the GPIB 488.2 interface are not
available through USB/RS-232. The IEEE-488 interface included with the 620L
conforms to the requirements of the IEEE-488.2 standard.
7.1. USB/RS-232 Interface
This interface provides all of the control commands and parameter setting commands
of the GPIB interface with the exception of some of the 488.2 Common Commands
and SRQ capability. All commands can be found in section 7.4. USB/RS-232/GPIB
Command List. The identification command *IDN and the Status Reporting
commands are also available through USB/RS-232.
7.1.1. USB/RS-232 Connector
The USB/RS-232 cabling should be configured as follows for a 9-pin serial port
interface:
Instrument RS-232 Port PC / Bus Controller
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