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2.2.2 TTL Communications

A standard DB-9F or 4 pin power connector/communication (female) connector is needed for TTL com-

munications. Power may also be supplied via this connector if desired. A PC is not to be used when TTL

communication is established via a direct com port. One modiﬁcation is required for TTL. The jumps must

be removed from the RS232 selection and placed on the TTL selection.

Figure 12: TTL Select

Note that this device uses signal levels from 0V to + 5V on the TTL setting.

Table 6: RS-232 Pinout

Pin Number Direction Description LCD Host

2 Data from LCD Data out (LCD) Tx Rx

3 Data to LCD Data in (LCD) Rx Tx

5 - Ground gnd gnd

For TTL communication via the 4 pin connector, please see the ﬁgure and table below.

1 2 3 4 12 34

Figure 13: Power Connector

Matrix Orbital LK202-25 11

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 49 50

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