Matrix-orbital LK402-25 Legacy Instrukcja Użytkownika Pobierz pdf (Strona 11)

WARNINGS

• Do not apply any power with reversed polarization.

• Do not apply any voltage other than the speciﬁed voltage.

2.3 Protocol Select Jumpers

The Protocol Select Jumpers, pictured below in ﬁgure 12, 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 solder jumps on the 232 jumpers. In order to place the display module in I

C mode you must ﬁrst

remove the solder jumps from the 232 jumpers and then place them on 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.

Figure 12: Protocol Select Jumpers

2.4 General Purpose Outputs

A unique feature of the LK402-25 is the ability to control relays and other external devices using a

General Purpose Output, which can provide up to 20 mA of current and +5Vdc from the positive side of

the GPO. This is limited by a 240 ohm resistor which is located to the above right of the GPOs as pictured

below in ﬁgure 16. If the device, which is being driven by a GPO, requires a relatively high current (such as

a relay) and has an internal resistance of its own greater than 250 ohms, then the 240 ohm resistor may be

removed and replaced with a Jumper.

- GND

+ MAX: 20 mA, +5Vdc

Figure 13: General Purpose Output

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Matrix-orbital LK402-25 Legacy Instrukcja Użytkownika Strona 11