Matrix-orbital LK204-24-USB Manuel d'utilisateur télécharger pdf (Page 13)

2.1.5 Serial TTL Communication

Figure 7: Rx / Tx LED Header

The display can also be talked to at TTL (logic 0V to +5V) levels. This will allow TTL communications

through the 4-pin header. Communicating by Serial TTL will bypass the USB components and power will

be required to be provided by this header.

8bit, no parity, one stop bit.

Speed: 19.2 Kb/s.

NOTE Do not power or communicate by USB and Serial TTL at the same time.

2.1.6 LED Headers

The LED headers provide a visual indication of communication over the Rx and Tx line if a LED is

connected. The LEDs 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 number of general purpose outputs for a variety of applications.

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Matrix-orbital LK204-24-USB Manuel d'utilisateur Page 13