9-3
You can select the 2700 handshaking protocol, RTS/CTS or XON/XOFF. In addition, you can
select baud rate, data length (bits per character), parity, stop bit, and configuration (multipoint
or point-to-point). For information on communications setup, see Section 4.2, Menu Setup. The
communications menu is a submenu of General setup.
Listed below are the default settings and options for each communications parameter mentioned
above. The default value is listed first. The options are in parentheses.
Baud rate:
9600
(4800, 2400, 1200, 600, 300)
Data Length:
7
(8)
Parity:
Even
(odd, low, high, none)
Stop Bit:
1
(2)
Handshake:
RTS/CTS
(XON/XOFF, None)
Configuration:
non-multidrop
(multidrop)
Data and Command Format. The 2700 behaves like a "slave" to the host computer. It never
talks to the host unless in response to a command from the host. The 2700 will respond with an
ASCII < BEL> followed by the display of an error code, or "?" for an illegal command.
A command is defined to be a string of printable upper case ASCII characters. Blanks are
ignored.
Command Grammar. The command grammar is shown below. Abbreviations include ESC
(escape), cmd (command), addr (address), arg (argument) and cr (carriage return).
<ESC> & <cmd> [arg] <cr>
(non-multidrop)
<ESC> <addr> <cmd> [arg] <cr>
(multidrop)
In this grammar, < addr> is a single byte (binary) node address that you assign to the 2700
SELECT. You make the assignment via the instrument keypad. The 2700 SELECT only
responds to commands with the < addr> field that matches the assigned address.
A command may require one or more arguments. If multiple arguments are given, they must be
separated by a semicolon (;). Two consecutive semicolons indicate a NULL argument, in which
case, depending on the command, a default parameter is supplied.
The 2700 responds to a legal command with a status acknowledgment (A), or an error code
(1,2,6,7,8 or 9) The interpretations of the status characters are discussed under Communications
Commands, Remote Control Commands (in Section 9.3).
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