Model 350AH1A
Rev B
17
The baud rate for the Fiber-Optic Serial port is user selectable from the RS-232/Fiber-Optic Serial Baud Rate
selection screen. To get there from the Main Menu, touch the User menu button followed by the I/O menu
button and finally the Serial menu button. A thin black outline indicates the present baud rate selection. When
the back button is pushed the baud rate selection is stored to non-volatile memory. Therefore, if power is lost
prior to hitting the back button, any baud rate selection changes will be lost. The default baud rate is 19200.
NOTE: This baud rate setting is shared by both the Fiber-Optic serial port and the RS-232 port.
The Fiber-Optic port provides the user with the ability to optically isolate the controlling PC from the model
350AH1A. This can be useful in an environment where RF/Microwave energy could be coupled onto a
connection to one of the “wired” communications ports and fed back to the controlling PC.
Both optical connections (TX and RX) are optimized to work with light at a wavelength of 820nm. For more
detailed specifications on this port, consult the Avago HFBR series datasheet found at
A glass, multi-mode, fiber-optic cable of 200um is recommended, however fiber-optic cable as small as 50um
can be used. The connector type for this port is ST.
This port can be used in conjunction with either an AR model IF7000 RS-232 to Fiber-Optic Interface (1200
to 9600 baud only) or an AR model IF7001 USB to Fiber-Optic Interface (19200 baud only). Note that these
devices use SMA connectors so a fiber-optic cable is needed with ST connectors on one end and SMA
connectors on the other. This cable can be obtained from a fiber-optic cable distributor such as Fiber
Instrument Sales (FIS). Their web-site can be found at www.fiberinstrumentsales.com. An example cable that
will work for this connection is FIS Part Number D615M7FIS. The 7 in the part number refers to the length
of the cable. In this case the length is 7 meters.
2.6.4
USB Communications
The USB port is a USB 2.0 port. It also complies with the USB Test and Measurement Class (USBTMC)
Standard. Communications with this port requires the host computer to have a USBTMC driver available. All
commands and queries through this port must be terminated with a Line Feed character.
The cable required to make this connection is a USB 2.0 A-B peripheral device cable. The cable can be no
longer than 5 meters. If a longer distance is required a USB hub must be used. A cable carrying the official
USB logo is recommended.
When connected to a PC running Windows 2000 or XP a window will pop-up labeled Hardware Wizard. If
this PC has National Instruments LabView installed it will have a USBTMC driver that will work with this
port. This driver will allow the device to be easily controlled using National Instruments Measurement and
Automation Explorer or LabView. It should be noted that the USBTMC driver provided by National
Instruments is a Virtual Instrument Software Architecture (VISA) driver which can be used with other
programming languages besides LabView. For more information on this please consult the National
Instruments Website found at www.ni.com.
NOTE: All firmware updates are done through the USB port.
2.6.5
Ethernet Communications
The Ethernet port allows remote control through a Transmission Control Protocol (TCP) data channel. All
commands and queries through this port must be terminated with a Line Feed character.
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