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The IEEE-488 connection allows up to 15 different calibrators, PC's,
and items of test equipment to be connected together in a bus
arrangement. The communications speed is much faster than RS-
232, but it requires the purchase and installation of special PC
interface card(s) and connecting cable(s).
This section describes the set up of the two types of connections,
and the general operation of the command set. Section 10
describes the individual commands in detail.
9.2 Setting up the RS-232 Port for Remote Control
The CL3001 is fully programmable over a standard RS-232 link with
a PC. The RS-232 cable length for the port should not exceed 15
meters (50 feet), although longer cable lengths are permitted if the
load capacitance measured at a connection point (including signal
terminator) does not exceed 2500 pF.
The serial communications parameters in the CL3001 are fixed at the
following values:
• 9600 baud
• 8 data bits
• 1 stop bit
• no parity
• Xon/Xoff
• EOL (end-of-line) character CR (Carriage Return)
A typical RS-232 connection is shown in Figure 31. Note the use of
a null modem cable for the connection. See section 2.5 for the
location of the RS-232 port on the rear panel of the CL3001.
9.2.1 Using the CL3001 on Computers with USB Ports
The CL3001 can be used with a computer having only USB ports
with the use of a USB to serial converter.
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