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9 Digital Communication Interface
57
9.1.2.2 Sample Period
The sample period is the next parameter in the menu and prompted with
“
SAMPLE
”. The sample period is the time period, in seconds, between
temperature measurements transmitted from the serial interface. If the sample
period is set to 5, the bath transmits the current measurement over the serial
interface approximately every five seconds. The automatic sampling is
disabled with a sample period of 0. Press “SET” to choose to set the sample
period. Adjust the period with “UP” or “DOWN”. Press “SET” to set the
sample period to the new value or “EXIT” to abort and skip to the next
parameter.
9.1.2.3 Duplex Mode
The next parameter is the duplex mode indicated with “
dUPL
”. The duplex
mode may be set to half duplex (“
HALF
”) or full duplex (“
FULL
”). With full
duplex any commands received by the bath via the serial interface are executed
and immediately echoed or transmitted back to the device of origin. With half
duplex the commands are executed but not echoed. The default setting is full
duplex. The mode may be changed using “UP” or “DOWN”. Press “SET” to
save the new setting or “EXIT” to abort and skip to the next parameter.
9.1.2.4 Linefeed
The final parameter in the serial interface menu is the linefeed mode. This pa-
rameter enables (“
On
”) or disables (“
OFF
”) transmission of a linefeed charac-
ter (LF, ASCII 10) after transmission of any carriage-return. The default setting
is with linefeed on. The mode may be changed using “UP” or “DOWN”. Press
“SET” to set the sample period to the new value or “EXIT” to abort and skip to
the next parameter.
9.1.3 Serial Operation
Once the cable has been attached and the interface set up properly the control-
ler will immediately begin transmitting temperature readings at the pro-
grammed rate. The set-point and other commands may be sent to the bath via
the serial interface to set the bath and view or program the various parameters.
The interface commands are discussed in Section 9.2, Interface Commands.
9.2 Interface Commands
The various commands for accessing the bath controller functions via the digi-
tal interfaces are listed in this section (see Table 5 starting on page 59). These
commands are used with the RS-232 serial interface. The commands are termi-
nated with a carriage-return character. The interface makes no distinction be-
tween upper and lower case letters, hence either may be used. Commands may
be abbreviated to the minimum number of letters, which determines a unique