Matrix Orbital GLK12232-25-SM Legacy User Manual

Page 12

Table 1: RS-232 Pinout

Pin Number

Direction

Description

LCD

Host

Data from LCD

Data out (LCD)

Data to LCD

Data in (LCD)

Ground

gnd

Please see the following figure below for the default RS232 configuration.

Figure 5: Default RS232 Configuration

3.1.3 TTL Communications

This device complies with the EIA232 standard in that it uses signal levels from +/-12V to +/- 12V. It will

also operate correctly at TTL (0 to +5V) levels. To configure to TTL mode you must remove the jumpers

from the RS232 location and place new jumpers on the indicated TTL setting. Please see the figure below

for TTL configuration.

Figure 6: TTL Connections

3.1.4 I

C Communications

The display has I

C communications running at 100 Kbps and up to 127 units on a single communica-

tions line. The I

C data line operates on 5 volt CMOS levels. The display does not work on I

C by default.

To configure to I

C mode you must remove the jumpers from the RS232 location and place new jumpers on

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GLK12232-25-SM