3configuring rs-232 and i2c, 3configuring rs-232 and i – Matrix Orbital LK204-25 Legacy User Manual
Page 10
complies with the EIA232 standard in that it uses signal levels from ± 3V to ± 12V. It will not operate
correctly at TTL (0 to +5V) levels.
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
The power connector on the PC cable is wired as shown in Figure 2-8.
2.1.3Configuring RS-232 and I
2
C
RS-232 baud rate and I
2
C address are configured by means of jumpers.
Figure 2-9 RS-232 jumpers
The module is supplied with jumpers J1 and J2 installed, which gives an RS-232 baud rate of 19200 and an
I
2
C address of 0x5C.
RS-232 port: J0, J1, J2 - control baud rate. RS-232 format is 8N1 (8 bits, no parity, one stop bit)
I²C port: J0, J1, J2, J3 - sets slave peripheral address
Baud Rate
Slave Address
J3
J2
J1
J0
1200
50H
out
out
out
out
52H
out
out
out
in
2400
54H
out
out
in
out
56H
out
out
in
in
9600
58H
out
in
out
out
5AH
out
in
out
in
19200
5CH
out
in
in
out
5EH
out
in
in
in
1200
60H
in
out
out
out
62H
in
out
out
in
LK204-25 rev 1
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