Sensor Common Point; Communication Ports - Deif SGC 420 User Manual

3.16 Sensor common point

Category
Controller terminal
Range
Accuracy
The sensor common point (SCP) terminal 16 must be connected directly to an electrically sound point on the engine body. This point
serves as a common reference point for all analogue sensors. The electrical cable used for the connection must not be shared with
any other electrical connection. This wiring practice is strongly recommended to ensure that there is negligible potential difference
between the engine body and the controller's SCP terminal, and that predictable and accurate analogue sensor measurements are
always available in a wide variety of field conditions.

3.17 Communication ports

Category
USB
RS-485 Serial Port
Controller terminals
CAN
Controller terminals for CAN
NOTE • The RS-485 port on the controller supports a protocol based on Modbus.
• Use two core shielded twisted pair cable for Modbus RS-485 connection.
• Terminal 30 should be connected to master's isolated ground only.
• Keep terminal 30 connection open if shielded cable is not available.
• Do not connect terminal 30 to the negative battery terminal (DC -).
USER MANUAL 4189341227A UK
Specifications
16
±2 V
±2 % of full scale
Specifications
USB 2.0 type B for connection to PC with DEIF Smart Connect software
Half Duplex
Max. Baud Rate 115200
Data connection 2-wire
Termination resistor of 120 Ω is provided between output terminals A and B
Common-mode operating range
Maximum distance of line is 200 m
30 (GND)
31 (A)
32 (B)
Baud rate: 250 kbps
Packet size: 8 bytes
Termination resistor of 120 Ω is provided
58 and 59
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