DKG-379 User Manual Rev_02
V-15
(24-12-2012)
K43D01-EN - 83 -
The unit offers the possibility of MODBUS communication via its RS232 serial port. The connection to the
MODBUS master may be done in 3 ways:
1) RS232 connection using directly the RS232 port provided.
2) RS422/485 connection using external RS422/485 converter.
3) Modem connection using external modem.
The MODBUS mode is activated by assigning a controller address to the unit using program parameter.
The possible address range is 1 to 144. Setting the address 0 will
disable
the MODBUS mode and allow
communication under RAINBOW protocol.
The MODBUS properties of the unit are:
-Data transfer mode: RTU
-Serial data: 9600 bps, 8 bit data, no parity, 1 bit stop
-Supported functions:
-Function 3 (Read multiple registers)
-Function 6 (Write single register)
-The answer to an incoming message is sent with min 4.3ms delay after message reception.
Detailed descripti
on about the MODBUS protocol is found in the document “
Modicon Modbus Protocol
Reference Guide
”
.
This document may be downloaded at:
www.modbus.org/docs/PI_MBUS_300.pdf
ADDRESS
(hex)
R / W
DATA
SIZE
COEFFICIENT DESCRIPTION
0003
R
16bit
x10
Genset DC voltage
0004
R
16bit
x10
Battery bank DC voltage
0006
R
16bit
x10
Genset DC current
0016-0017
R
32bit
x256
Genset active power: this 24 bit signed register holds
the genset active power multiplied by 256. Least
significant 16 bits are in the register 0016h. Most
significant 8 bits are in the LSB of the register 0017h.
0024
R / W
8bit
x1
Year as a BCD byte. Values are from 0 to 99h.
0025
R / W
8bit
x1
Month as a BCD byte. Values are from 1 to 12h.
0026
R / W
8bit
x1
Date as a BCD byte. Values are from 1 to 31h.
0027
R / W
8bit
x1
Hours as a BCD byte. Values are from 0 to 23h.
0028
R / W
8bit
x1
Minutes as a BCD byte. Values are from 0 to 59h.
0029
R / W
8bit
x1
Seconds as a BCD byte. Values are from 0 to 59h.
002A
R
16bit
x0.1
Engine speed (rpm)
002B
R
16bit
x10
Oil pressure multiplied in bars.
002C
R
16bit
x1
Coolant temperature in degrees C.
002D
R
16bit
x1
Fuel level as %
002F
R
16bit
x10
Genset Battery voltage
0030
R
8bit
x50
Charge input voltage
19.1. Modbus Register Map
19. MODBUS SUPPORT
