2.3.8
IRIG-B Timing Signals
To accurately synchronize the 933A to an IRIG-B signal as a reference,
you must have a good IRIG-B signal connected to the IRIG-B IEEE 1344
BNC connector on the 933A. This is an unmodulated IRIG-B (DC Level
Shift) signal. See also Clock Setup in Synchronized Mode in Section 3.3.3.
IRIG-B Setup
1. Connect the IRIG-B signal cable to the IRIG-B connector (BNC) on
the front panel of the 933A.
2. Once connected and operating, the 933A will automatically detect
the presence of the IRIG-B signal and adjust the internal real-time
clock.
2.3.9
Communication Ports
The Model 933A has two communications ports located on the front panel;
USB 1.1 and RS-232C. Both communication ports serve to provide a
configuration and data acquisition link to the 933A.
Use PSCSV to maximize the operation of the 933A. While most
features are available from the front-panel keys, use PSCSV to configure
features and also to download data.
The Model 933A can also send a single bitmapped file to a terminal
or computer running a terminal program by pressing the Print key. For
more information on downloading bitmapped data, see Bitmapped File
Downloading at the end of this chapter.
USB 1.1
To connect to the 933A USB port, the pc requires a virtual COM port
be set up on it. Virtual COM port (VCP) drivers cause the USB device
(i.e. 933A) to appear as an additional COM port available to the PC. In
this way, PSCSV application software can access the 933A USB port in
the same way as it would access a standard COM port. Therefore, to use
the USB port on the 933A, you must install the 933 FTDI USB Driver, an
available download from the Arbiter website.. To connect using the USB
port, see Section 6.2.4 in “PSCSV Basics”.
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