Page 28 · 6300 Series ComboSource User’s Manual
RS232 Connector
The RS232 connection is male DB-9 connector wired in a NULL modem
configuration.
Pin Description
2 Receive
3 Transmit
5 Ground
1,4,6 Commoned together
7,8 Commoned together
9 No connection
Shell Earth ground
RS232 Connector (DB-9 Male)
For more information on using the RS232 interface, see the Computer
Interfacing Manual which is included on the CD that accompanied this product.
Grounding Considerations
A key feature of the ComboSource is the optical isolation of both the
photodiode and modulation inputs. By isolating these inputs, earth grounding of
the photodiode anode or cathode, or earth grounding the modulation input,
cannot cause a ground loop through the instrument. Likewise, the laser anode
and cathode connections are also isolated from earth ground.
However, if you use the earth ground pin of the Output connector, it is possible
to create a ground loop if the instrument’s earth ground is connected to a fixture
or optical table that is also earth grounded. Make sure that from your laser diode
package there is only a single path to earth ground.
Remote Mode Operation
“Remote mode” operation is when the ComboSource is being controlled by a
computer over the USB or RS232 interfaces. When in remote mode, the
ComboSource behaves differently, preventing you from affecting the operation
of the instrument, such as changing the set point. You cannot enter the menu
without taking the unit out of remote mode, and the knob is disabled, unless it
has been explicitly enabled by the Set While Rmt setting in the Comm Menu.
You can exit remote mode at any time by pressing the Menu button, which has
a secondary function to return the ComboSource to local operation.
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