emPC-A/RPI3
(
Hardware and
Software Manual)
•
Installation
3 - 13
Rev. 1.3
©
Janz Tec AG
1
2
11
12
11 CAN-H
12 CAN-L
13 GND-CAN
14 n.c.
table 6: CAN connector pins
An internal 120 Ohm CAN termination resistor is enabled by shorted jumper J400. To disable the
termination, the case has to be opened to remove this jumper.
CAUTION
Factory setting: Jumper J400 is
not
set by default, and therefore the 120 Ohm
termination resistor is disabled!
3.2.8
Digital IO
Digital input (DI1-DI4) and output (DO1-DO4) ports are provided on the multi IO connector (refer to
table 7).
1
2
9
10
1 DO4
2 DO3
3 DO2
4 DO1
5 GND-IO
6 VIO (10..32 VDC)
7 DI4
8 DI3
9 DI2
10 DI1
table 7: Digital IO connector pins
CAUTION
The digital IO must be powered by a SELV power supply, that complies with the
requirements of a limited energy source (LPS) (By using an appropriate supply or an
external fuse).
The digital inputs and outputs are isolated from system power supply. Refer to figure 4 for detailed
schematic.
The digital input signals (DI1-DI4) refer to GND-IO and have an input impedance of about 5 kOhm.
Switching level for
low
is
≤4V and
high
≥9V. The digital inputs do not require VIO to be present.
The output driver supports resistive and inductive loads.
NOTICE
When using inductive loads, the output driver has internal clamping to demagnetize the
VIO
VN330SP
Polarity
Reversal
Protection
DO
Output GPIO
GND-IO
DI
Input GPIO
Load
figure 5: digital IO detailed schematic