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7.1.3 Serial Operation
The serial communications uses 8 data bits, one stop bit, and no parity. The
set-point and other commands may be sent via the serial interface to set the
temperature set-point and view or program the various parameters. The inter
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face commands are discussed in Section 7.2. All commands are ASCII charac
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ter strings terminated with a carriage-return character (CR, ASCII 13).
7.2 Interface Commands
The various commands for accessing the calibrator functions via the digital se
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rial interface are listed in this section (see Table 2 beginning on page 40). These
commands are used with the RS-232 serial interface. The commands are termi
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nated with a carriage-return character (CR, ASCII 13). The interface 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 deter
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mines 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 com
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mand following a “=” character. For example, an “s” <CR> returns the current
set-point and “s=50.0” <CR> sets the set-point to 50.0 degrees.
In the following list of commands, characters or data within brackets, “[” and
“]”, are optional for the command. A slash, “/”, denotes alternate characters or
data. Numeric data, denoted by “n”, may be entered in decimal or exponential
notation. Characters are shown in lower case although upper case may be used.
Spaces may be added within command strings and will simply be ignored.
Backspace (BS, ASCII 8) may be used to erase the previous character. A termi-
nating (CR, ASCII 13) is implied with all commands.
Note: Commands that are preceded by a “C:” or an “H:” access the cold or hot
side respectively. If the “C:” or “H:” are not used, the command accesses the
cold side. It is highly recommended to always use “C:” or “H:” prefixes to en
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sure setting or reading a parameter on the correct controller. Responses to com
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mands do not indicate which controller the setting or reading applies to or came
from.
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7 Digital Communication Interface
Interface Commands