3 protocol select jumpers – Matrix Orbital LCD2041 User Manual

Page 15

2.2.1

Legacy Data Connector Jumpers

To reverse pins two and three of the Power/Data Connector remove the zero ohm resistors from the

Legacy Data Connector Jumpers, labeled with the

symbol and place them on the jumpers labeled with the

symbol. This will allow you to transmit on pin two, and receive data on pin three instead of the default

of receiving on pin two and transmitting on pin three of the Power/Data Connector.

Power/Data Connector

[

Pin 2

Rx \ SCL (I

C clock)

Pin 3

Tx \ SDA (I

C data)

[

Pin 2

Tx \ SDA (I

C data)

Pin 3

Rx \ SCL (I

C clock)

Figure 16: Legacy Data Connector Jumpers

2.3

Protocol Select Jumpers

The Protocol Select Jumpers, pictured below in

figure 17

, provide the means necessary to toggle the

display module between RS-232, TTL and I

C protocols. As a default, the jumpers are set to RS-232 mode

with zero ohm resistors on the 232 jumpers. In order to place the display module in I

C mode you must

first remove the zero ohm resistors from the 232 jumpers and then solder the resistors on to the I2C jumpers.
The display will now be in I

C mode and have a default slave address of 0x50 unless it has been changed.

Similarly, in order to change the display to TTL mode, simply remove the zero ohm resistors from the 232
or I

C jumpers and solder them to the TTL jumpers.

Matrix Orbital

LCD2041