2 Serial Modbus Interface at the X-BUS
This functionality is available from display version 1.00.06
on. The standard protocol for an additional serial port of the
gas controller X bus is ModBus RTU.
Definition of communication
The gas controller operates at the interface X bus only
as
Modbus slave
.
Baud rate 19,200 baud
1 start bit, 8 data bits
1 stop bit, even parity
Figure 1: Connection Setup
Figure 2: Modbus-Master
Modbus-Master-Controller:
The Modbus master controller must have a resistor matrix at the
fieldbus terminals as shown in the drawing on the right, so that the
voltage level is maintained at min. 0.5 V at bus pin A when the driver
is inactive. The resistor circuitry is already integrated in a Modbus
master controller.
3 Modbus Function 03 (Reading of Registers)
Read Holding Registers (reading of holding registers) is used to receive data from the DGC-06 sy-
stem. There are 9 data blocks:
3.1 Current value of digital sensors – sensor addresses 1–96, Modbus register addr. 1001–1096
3.2 Current value of analog sensors – sensor addresses 1–32, Modbus register addr. 2001–2032
Figure 3: Current value of analog sensors – sensor addresses 1–32, Modbus register addr. 2001–2032
2200 R
Intern
(Master Board)
Feldbus
560 R
2200 R
BUS_A
BUS_B
GND
+ 5 V
INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.INTEC | inteccontrols.com
Specifications subject to change without notice. | GA_GC06_Modbus_supplement_E, 2022-04-05 | USA 221209 | Page 6 of 12
DGC6 Modbus Supplement – UserManual
