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User's Guide
10.1.2.1
10.1.2.2
10.1.2.3
10.1.2.4
10.1.3
44
reads "ProbE". This is the menu selection. Press "UP" repeatedly until the se-
rial interface menu is indicated with "SErIAL". Finally press "SET" to enter
the serial parameter menu. In the serial interface parameters menu are the
BAUD rate, the sample rate, the duplex mode, and the linefeed parameter.
Baud Rate
The baud rate is the first parameter in the menu. The display will prompt with
the baud rate parameter by showing "BAUd". Press "SET" to choose to set the
baud rate. The current baud rate value will then be displayed. The BAUD rate
of the 7009 serial communications may be programmed to 300, 600, 1200, or
2400 baud. The baud rate is pre-programmed to 1200 baud. Use "UP" or
"DOWN" to change the baud rate value. Press "SET" to set the BAUD rate to
the new value or "EXIT" to abort the operation and skip to the next parameter
in the menu.
Sample Period
The sample period is the next parameter in the menu and prompted with "SAm-
PLE". The sample period is the time period in seconds between temperature
measurements transmitted from the serial interface. If the sample rate is set to 5
for instance then the 1502 will transmit 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. Ad-
just the period with "UP" or "DOWN" and then use "SET" to set the sample
rate to the displayed value.
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 thermometer via the serial interface will
be immediately echoed or transmitted back to the device of origin. With half
duplex the commands will be executed but not echoed. The default setting is
full duplex. The mode may be changed using "UP" or "DOWN" and pressing
"SET".
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" and
pressing "SET".
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
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