Operating instructions
Gateway ZAbluegalaxy / DIG-2019NE
•
Installation
L-BAL-312-GB 2020 Index 001
12/23
2.2.2
Serial Port RS485 (DIG-2019NE)
The Serial Port is implemented by an SC16IS740 UART. The interface signals are located on the multi
connector, refer to table 2: Serial Port Connector pins.
1
2
11
12
15
16
11 D0-
12 D0+
13 GND0
14 n.c.
15 D1-
16 D1+
17 GND1
18 n.c.
Table 2: Serial Port connector pins
In the RS485 mode the bidirectional differential signals D+ and D- are provided. When the transmitter
is enabled and no data is sent (1=MARK), then D+ > D- (refer to figure 5).
Note that D+ corresponds to pin “A” of the transceiver chip. However, this is signal B according to the
EIA-485 or Profibus standards.
The receiver has the fail-safe input feature, which ensures that no data is received when D+ and D- are
floating or are shorted (e.g. by the termination resistor).
For each serial port, an internal 120 Ohm termination resistor can be enabled between D+ and D- by
shorting jumper J300 or J400. The case must be opened to access these jumpers.
2.2.3
CAN (Gateway ZAbluegalaxy)
The CAN interface is implemented with a MCP2515 controller chip. The interfaces is located on the
multi connector, refer to table 3. The CAN interface signals support ISO 11898-2 (high speed) and are
isolated from system logic, as result it is always required to connect
13
GND-CAN and
17
GND1-CAN
to the belonging CAN ground.
1
2
11
12
15
16
11 CAN-H
12 CAN-L
13 GND-CAN
14 n.c.
15 CAN1-H
16 CAN1-L
17 GND1-CAN
19 n.c.
Table 3: CAN connector pins
There are no internal 120 Ohm CAN termination resistors provided.
2.2.4
Graphics connector (HDMI)
Provided by Raspberry PI board.
D+
D-
1 = Mark
0 = Space
1 = Mark
Transmitter
idle
Startbit
Databit 0
Transmitter
tristate
"0V"
Voh
Vol
Figure 5: RS485 signalling
