D+ Charger Alternator; Sensor Common Point; Communication Ports - Deif SGC 120 User Manual

3.13 D+ Charger alternator

Category
Controller terminal
Voltage range
Excitation
Accuracy
The charge fail is a combined input and output terminal. When the genset starts, the terminal provides controlled power output to
excite the charging alternator. After the excitation is successfully done, the controller reads the charging alternator's output voltage
for monitoring its health. The action for charge fail is configurable.

3.14 Sensor common point

Category
Controller terminal
Range
Accuracy
NOTE The sensor common point (SCP) terminal 41 of the controller should be directly connected to an electrically sound point on
the engine body. This point on the engine body should serve as a common reference point for all analogue sensors such as
those for measuring lube oil pressure, engine temperature and fuel level. The electrical cable used for the connection
should not be shared with any other electrical connection. Such a wiring practice is strongly recommended to ensure that
there is negligible potential difference, if any, between the engine body and the controller's SCP terminal, and, predictable
and accurate analogue sensor measurements are always available in a wide variety of field conditions.

3.15 Communication ports

Category
USB
RS-485 Serial Port
Controller terminals for RS-485
CAN (SGC 120 only)
Controller terminals for CAN (SGC 120 only)
USER MANUAL 4189341226A UK
Specifications
7
0 to V
BATT
V = 8 to 28 V DC
BATT
PWM (power limited to 3 W, 12 V/250 mA)
±1 % of full scale
Specifications
41
±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 between output terminals A and B (internally
mounted)
Common mode operating range and bus pin fault protection up to ±70 V
Maximum distance of line is 200 m
15 and 16
Baud rate: 250 kbps
Packet size: 8 bytes
Termination resistor of 120 Ω is provided
13 and 14
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