Eppendorf Biological Shakers Innova 44R - Manual (Page 65)

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Biological Shakers Innova® 44/44R — Operating manual
Tab. 6: COM Parameters for HyperTerminal
Sample Test:
1. To request the current setpoint, type RS at the terminal. When you type R, you should see the
R on the computer display. This is an echo character, sent back by the Innova 44/44R. When
you type the S, you should see the echo S displayed at the computer.
2. Use the Enter key to send the carriage return control character. This will move the cursor
back over the first character.
3. RS is a Request command, so your shaker will send back the data corresponding to the
command.
15.2 Overview of command sets
Using an optional RS-232 interface, the user has the capability to control various functions of the
Innova 44/44R shakers by computer. A detailed command set follows this introduction.
The serial interface uses an echo character protocol setting that is implemented to indicate that a
valid character has been received by the shaker. For every character sent by the user computer,
the Innova 44/44R will return a matching character. This echo character should be read by the
computer and compared to the character that was sent.
In the following example, the Master (your computer) will command (the C in CS) the shaker
(Slave) to set its speed to 150 RPM:
In the next example, the Master (your computer) will request that the shaker (Slave) report (the R
in RV) the actual parameters:
This is the command set format:
Most commands are defined as two capital characters using standard ASCII format (see the
command sets provided below).
Baud Rate Enter the setting on your shaker (see Step 2 above)
Data Bits 8
Parity None
Stop Bits 1
Flow Control None
Hint!
When you are sending a command, do not allow the pause between any two characters of your
message to last longer than 10 seconds. If it takes any longer, the shaker’s serial port will reset
itself.
Master sends: Innova 44/44R responds:
CS150 CS150
Master sends: Innova 44/44R responds:
RV First the echo: RV
Then the report:
...
Hint!
On power-up, even if the shaker is not set in Slave mode at the time, the shaker will always send
these four characters: OK. Before starting any communications, be sure to clear the
computer’s receive buffer.
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Appendix A: Remote programming