Matrix Orbital LK162A-4T - Manual (Page 12)

Command Summary 8
4 Hardware
4.1 Standard Model
Communication/Power Header
Figure 7: Communication/Power Header
Table 4: Communication/Power Pinout
Pin Function
1 Vcc
2 Rx (SCL)
3 Tx (SDA)
4 Gnd
The Communication/Power Header provides a standard connector for interfacing to the LK162A-4T.
Voltage is applied through pins one and four of the four pin Communication/Power Header. Please
ensure the correct voltage input for your display by referencing Voltage Specifications before connecting
power. Pins two and three are reserved for serial transmission, using either the RS-232/TTL or clocking
data through the I²C protocol, depending on what has been selected by the Protocol Select Jumpers.
The versatile Tyco 640456-4-LF style header used can be mated to a number of connectors, the Molex
22-01-3047 for example.
Protocol Select Jumpers
The Protocol Select Jumpers provide the means necessary to toggle the LK162A-4T between RS-232, TTL
and I²C protocols. As a default, the jumpers are set to RS-232 mode with solder jumps on the RS232
jumpers. In order to place the display module in I²C mode you must first remove the solder jumps from
the RS232 jumpers and then place them on the I
2 C jumpers. The display will now be in I²C mode and
have a default slave address of 80, unless changed with the appropriate command. Similarly, in order to
change the display to TTL mode, simply remove the zero ohm resistors from the RS232 or I²C jumpers
and solder them to the TTL jumpers.