This section provides information on the proper use and configuration of bus remote
interface. The USB/RS-232 remote interface is standard on model 820X but the GPIB
(IEEE-488) interface option can be substituted for the USB/RS-232 interface. Please
refer to the Option section of this manual for details on the OMNIA options. The
USB/RS-232 interface also uses the same command set as the GPIB interface for
setting of test parameters. However there are many functions of the GPIB 488.2
interface that are not available through USB/RS-232. The IEEE-488 interface included
with OMNIA conforms to the requirements of the IEEE-488.2 standard.
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.
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. RS-232 Connector
The RS-232 cabling should be configured as follows for a 9-pin serial port interface:
7.1.2. Communications Port Configuration
The COM port should have the following configuration:
9600 baud
8 data bits
1 stop bit
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