SDA SCL
SDA SCL
SDA-SCL (J19) jumpers are used to activate the pull up resistors for SDA and
SCL pins of the I
2
C interface.
SDA-SCL jumper
J19
Function
Pull-up inactive
(jumper released)
Pull-up active
(jumper attached)
Important !
If more than one module are connected to I
2
C-bus, then only the SDA-SCL
jumpers of one of the modules need to be attached.
RS232 (J8) blue terminal is a connector for RS232 UART interface, TTL (J6)
blue terminal is a connector for TTL UART interface, while RS485 (J15) blue
terminal is a connector for RS485 UART interface.
J8 (RS232)
Pin
Name
Function
1
GND
Ground reference
2
TX
UART (RS232) output line from the module
3
RX
UART (RS232) input line to the module
J6 (TTL)
Pin
Name
Function
1
GND
Ground reference
2
TX
UART (TTL) output line from the module
3
RX
UART (TTL) input line to the module
J15
Pin
Name
Function
1
GND
Ground reference
2
D-
Data line (inverting –)
3
D+
Data line (non-inv)
5
