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the serial interface to set the bath and view or program the various parameters.
The interface commands are discussed in Section. All commands are ASCII
character strings terminated with a carriage-return character (CR, ASCII 13).
10.2
IEEE-488 communication (optional)
The IEEE-488 interface is available as an option. Baths supplied with this op-
tion may be connected to a GPIB type communication bus which allows many
instruments to be connected and controlled simultaneously.
10.2.1
Setup
To use the IEEE-488 interface first connect an IEEE-488 standard cable to the
back of the bath. Next set the device address. This parameter is programmed
within the IEEE-488 interface menu. The IEEE-488 interface parameters menu
is outlined in Figure 6.
To enter the IEEE-488 parameter programming menu first press "EXIT" while
pressing "SET" and release to enter the secondary menu. Press "SET" repeat-
edly until the display reaches "PrObE". This is the menu selection. Press "UP"
repeatedly until the IEEE-488 interface menu is indicated with "IEEE". Press
"SET" to enter the IEEE-488 parameter menu. The IEEE-488 menu contains
the IEEE-488 address parameter.
10.2.1.1
IEEE-488 Interface Address
The IEEE-488 address is prompted with "AddrESS". Press "SET" to program
the address. The default address is 22. Change the device address of the bath if
necessary to match the address used by the communication equipment by
pressing "UP" or "DOWN" and then "SET".
10.2.2
IEEE-488 Operation
Commands may now be sent via the IEEE-488 interface to read or set the tem-
perature or access other controller functions. All commands are ASCII charac-
ter strings and are terminated with a carriage-return (CR, ASCII 13). Interface
commands are listed below.
10.3
Interface Commands
The various commands for accessing the bath controller functions via the digi-
tal interfaces are listed in this section (see Table 4). These commands are used
with both the RS-232 serial interface and the IEEE-488 GPIB interface. In ei-
ther case the commands are terminated with a carriage-return character. The in-
terface makes no distinction between upper and lower case letters, hence either
may be used. Commands may be abbreviated to the minimum number of letters
which determines a unique command. A command may be used to either set a
parameter or display a parameter depending on whether or not a value is sent
with the command following a "=" character. For example "s"<CR> will return
Digital Communication Interface
45
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