Matrix Orbital LK202-24-USB - Manual (Page 12)

2.1.4 Serial TTL Communications
Figure 6: Rx / Tx and LED Headers
The display can be communicated to by Serial at TTL levels. Communication will bypass the USB
section and requires power and ground to be provided by the header. Do not use this header in conjunction
with USB communication.
8bit, no parity, one stop bit.
Speed: 19.2 Kb/s
2.1.5 LED Headers
The LED headers provide a visual indication of communication over the Rx and Tx line if a LED is
connected. The LED’s blink frequency will increase as the amount of data increases. The headers are
current limited to 20mA at +5V. This feature only works with USB communication and will not work with
serial TTL.
2.2 General Purpose Outputs
The display has a variety of general purpose outputs for a variety of applications.
Matrix Orbital LK202-24-USB 8