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7341
Users Guide
Setup
Before operation the serial interface of the bath must first be set up by programming the baud rate
and other configuration parameters. These parameters are programmed within the serial interface
menu.
To enter the serial parameter programming menu, press "EXIT" while holding down
"SET", then release both buttons 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.
Baud Rate
The baud rate is the first parameter in the menu. The display prompts with the baud rate
parameter by showing "BAUd". Press "SET" to choose to set the baud rate. The current
baud rate value is displayed. The baud rate of the bath may be programmed to 300, 600,
1200, or 2400 baud. The baud rate is pre-programmed to 2400 baud. Use "UP" or
"DOWN" to change the baud rate value. Press "SET" to set the baud 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 "SAnpLE". 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.
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.
Linefeed
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". Press "SET" to set the sample period to
the new value or "EXIT" to abort and skip to the next parameter.
Serial Operation
Once the cable has been attached and the interface set up properly the controller will
immediately begin 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
Interface Commands.
IEEE-488 Communication (optional)
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, the GPIB cable should be
10-4
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Troubleshooting
