Matrix Orbital LK204-25 Legacy - Manual (Page 12)

1 DB-9 Connector 5 Power / Data Connector
2 Power Through DB9 Jumper 6 Keypad Interface
3 GPOs 7 Protocol Select Jumpers
4 Manual Override 8 Optional Dallas 1-Wire Bridge
Figure 13: LK204-25
2.1 DB-9 Connector
The LK204-25 provides a DB-9 Connector to readily interface with serial devices which use the EIA232
standard signal levels of ±12V to ±12V. It is also possible to communicate at TTL levels of 0 to +5V by
setting the Protocol Select Jumpers to TTL. As an added feature it is also possible to apply power through
pin 9 of the DB-9 Connector in order to reduce cable clutter. However, in order to accomplish this you must
set the Power Through DB-9 Jumper.
Matrix Orbital LK204-25 8