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LAMBDA SC OPERATION MANUAL – REV. 1.14C (20190606)
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11.
REMOTE CONTROL: SERIAL PORT
The Lambda SC microprocessor sets the serial RS-232C port, by default, as the input source
upon startup. An appropriate command from the remote computer through the serial port
will automatically set that port as the active input source and the display on the controller
will reflect that change on its bottom line. The serial port will remain active until an
appropriate command is sent from a remote computer through the USB port. There are,
obviously, some basic differences in the physical connections and the modes by which serial
and USB data are transmitted to the controller. The command code and return code
structures are, however, for the most part, the same. The connection and command
structure required to control the Lambda SC via the Serial port are discussed in this chapter.
NOTE: The RS-232 serial port is absent on early versions of the Lambda SC controller. If you
have a version of the Lambda SC that does not have the serial port, and you would like to
have it added, please contact Sutter Instrument Co. to arrange for an upgrade.
11.1
Connecting to the Serial Port
The serial interface connector on the back of the Lambda SC controller cabinet is a DB-9
female connector. The connections are arranged so that a standard DB-9 serial cable can be
used to connect the controller to a PC serial port. The port operates on a minimal RS-232
protocol where only the signal ground and the two data lines (transmit and receive) are
connected; the hardware control lines are not connected. This port is designed for connection
to a standard computer serial port. It should not be connected to any other type of interface
or device. The pin assignments for this connector are, as viewed from the back of the
controller:
Figure 11-1. Serial port pin assignments
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