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7108
Users Guide
To enter the serial parameter programming mode first press "EXIT" while
pressing "SET" and release to enter the secondary menu.
Press "SET" repeatedly until the display reads "ProbE". This is the menu
selection. Press "UP" repeatedly until the serial 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.
9.1.2.1
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
7108 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.
9.1.2.2
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
rate is set to 5, the 7108 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" and then use "SET" to set the sample
rate to the displayed value.
9.1.2.3
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 are 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" and pressing "SET".
9.1.2.4
The final parameter in the serial interface menu is the linefeed mode. This
parameter enables ("On") or disables ("OFF") transmission of a linefeed
character (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".
9.1.3
Serial Operation
Once the cable has been attached and the interface set up properly the controller
immediately begins transmitting temperature readings at the programmed 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 Section9.3. All commands are ASCII
character strings terminated with a carriage-return character (CR, ASCII 13).
9.2 IEEE-488 Communication
The IEEE-488 interface is available as an option. Baths supplied with this option
may be connected to a GPIB type communication bus which allows many
instruments to be connected and controlled simultaneously. To eliminate noise,
9-2
Baud rate
Sample Period
Duplex Mode
Linefeed
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