oventrop Aktor M ST L Modbus, Operating Instructions Manual, Page: 15 / 20

„Aktor M ST L Modbus“ Appendix
15
101274584-V01.11.2019
10. Appendix
10.1 Modbus topology
24V
D
-
0
V
D
+
1 2 3 4
AKTOR
24V D
-
0
V
D
+
1 2 3 4
AKTOR
24V D
-
0
V
D
+
1 2 3 4
AKTOR
24V D
-
0
V
D
+
MASTER
24V
24V
0V
02
01 n
00
Illust. 7: Modbus topology
NOTICE
Disturbances during signal transmission in the bus system
If the Modbus is not terminated correctly, communication disturbances between the components may
occur.
f
Install a terminal resistance (120 Ohm) at the beginning and the end of the Modbus between the
data lines D+ and D-.
10.2 Data point list
Register
address
Data
type
Name R/W Values
0 uint16 Type r
1
: Aktor
1 uint16 FW version r e.g. 123 = version 1.23
2 uint16 HW identifier r e.g. 0x00F1
3 uint16 SerNum1 r 0-65535
4 uint16 SerNum2 r 0-65535
5 uint16 SerNum3 r 0-65535
101 uint16 Time hour r/w 0-23 to be set manually (no battery buffered RTC)
102 uint16 Time minute r/w 0-59 to be set manually (no battery buffered RTC)
105 uint16 RS485 Baud rate r/w 0: default (38400,N,8,2) ; 1: 9.600 ; 2: 19.200 ; 3: 38.400 ; 4:
57.600 ;
5: 115.200
106 uint16 RS485 Stop bits r/w 1, 2
107 uint16 RS485 Parity r/w 0: none ; 1: even ; 2: odd
110 uint16 Selection of the current
valve characteristic line r/w 0: linear
1: Cocon QTR DN40 1500-7500 l/h
2: Cocon QTR DN50 IG 3500-14000 l/h
3: Cocon QTR DN40 AG 1500-7500 l/h
4: Cocon QTR DN50 AG 3500-10000 l/h
5: Cocon QFC DN40 1500-7500 l/h
6: Cocon QFC DN50 2000-8000 l/h
113 uint16 Maximum volume flow
of the selected valve
r In l/h, is set when selecting the valve characteristic line