Sutter Instrument Lambda 10-3, Operation Manual

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LAMBDA 10-3 OPERATION MANUAL – REV. 3.03 (20110829)
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6.
6. 6.
6. EXTERNAL SERIAL RS
EXTERNAL SERIAL RS EXTERNAL SERIAL RS
EXTERNAL SERIAL RS----232 INTERFACE CONTROL
232 INTERFACE CONTROL 232 INTERFACE CONTROL
232 INTERFACE CONTROL
The Lambda 10-3 microprocessor sets the serial RS-232C port, by default, as the input source
upon startup and anytime the ON LINE key is pressed. 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 or until the LOCAL key is pressed on the controller keypad.
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 10-3 via the Serial port are discussed in this
chapter.
6.1 6.1 6.1 6.1 Connecting to the Serial Port Connecting to the Serial Port Connecting to the Serial Port Connecting to the Serial Port
The serial interface connector on the back of the Lambda 10-3 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 6-1. Serial port pin assignments.
Communication for the serial port requires the following settings:
Baud rate Baud rate Baud rate Baud rate 9600 9600 9600 9600
Data bits
Data bits Data bits
Data bits 8
8 8
8
Parity
Parity Parity
Parity none
none none
none
Stop bits Stop bits Stop bits Stop bits 1 1 1 1
Flow control: Flow control: Flow control: Flow control: none (some none (some none (some none (some terminal programs may require this setting) terminal programs may require this setting) terminal programs may require this setting) terminal programs may require this setting)
No hardware control lines are connected. You must set the communication mode so that
either these lines are ignored or so they provide connections that will satisfy the mode of