Modbus Registers OPTIMA...GOMOD

Short instruction 227VM-024-05-MB
Written by: Michael Köhle Date: 13.11.2014 08:56:00 Side 13 of 13
2.1.7. Description interface parameter Modbus
Display
Number
EEPROM-
value Baudrate Parity Stop bits
1 0 1200 none 2
2 1 1200 even 1
3 2 1200 odd 1
4 3 2400 none 2
5 4 2400 even 1
6 5 2400 odd 1
7 6 4800 none 2
8 7 4800 even 1
9 8 4800 odd 1
10 9 9600 none 2
11 10 9600 even 1
12 11 9600 odd 1
13 12 19200 none 2
14 13 19200 even 1
15 14 19200 odd 1
16 15 38400 none 2
17 16 38400 even 1
18 17 38400 odd 1
3. Remarks
The standard value for V
nom
of the 227VM-024-05-MB model is 250 Pa. If you want to adjust the V
nom
value to 150 Pa (normal value you’re using) there are several ways doing it:
1. Use our VAV software and the interface and change the value to 150 Pa and the air flow, con-
firm the values by pressing enter.
2. Use a software for the Modbus communication e.g. Modbus poll and write in register 200 the
new value e.g. 150 Pa the written value needs to be 15000. Then it is also possible to set a new
airflow at this differential pressure. Write the password (FFFF
h
) in register 1793 to unlock regis-
ter 523 and write in the desired value. Lock register 523 by writing the value 0 to register 1795.
There are two different possibilities using the actuator in proportional control mode (register 201):
Writing the value 4 into the register 201 (pre-set) and the display will indicate this with the dot
on l/s, the second possibility is writing the value 5 in the register this will be indicates with the
dot on m
3
/h.
In general the actuator can be used as analogue model (register 122 = 0) then it’s regulating according
to the applied voltage on input Y. The second option is that it’s controlled via Modbus (register
122 = 1). Then the desired position can be set in % via register 0, e.g. 10% = 1000.
The feedback signal provides the output signal according to the selected mode (0(2)…10 V) related to
the nominal flow.
Example: V
nom
is 100 l/s @ 250 Pa, V
act
= 10 l/s  feedback signal (theoretical) = 1 V.