Matrix-orbital GLK24064-25 Legacy Manual do Utilizador descarregar pdf (Página 14)

This will allow TTL RS-232 levels of communication through the DB-9 connector or the power connec-

tor.

2.2.3 RS-232 Communication through the Power Connector

RS-232 communication can also be achieved through the middle two pins of the power connector.

Figure 12: Power Connector

Table 4: Connector Pinout

Pin 4 Ground

Pin 3 Rx

Pin 2 Tx

Pin 1 Vdc

To allow this, the jumpers must be set as indicated below;

Figure 13: RS-232

2.2.4 I

C Communications

The display has I

C communications running at 100 Kbps and up to 127 units can be on a single com-

munications line. The display’s I

C communication lines are the two middle pins of the power connector.

They are shared with RS-232 and have to be turned on. The I

C data line operates on 5 volt CMOS levels.

The default I

C address is 0x50.

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