4. Data communication
If readings are to be retrieved via data communication, this
must be done as follows:
Expansion module - m2+
The AK-SM 350 can display data from up to 65 measuring
points. Some of these measuring points can originate from
expansion modules.
The m2+ has a capacity of 7 addresses, i.e. it can be linked to up
to 7 points.
Cable
An m2+ must be connected to RS485 - TP.
The AK-SM 350 must be one end of the data communication.
Wiring
A must be wired to A.
B must be wired to B.
The COM terminal can be used for the cable screen.
The screen must not be earthed.
Termination
The AK-SM 350 is already terminated at the PCB. A resistor
should not be fitted.
The peripheral m2+ unit must be terminated. The two connec-
tions A1 and B1 are connected here. See drawing.
Addressing
The address of an m2+ is provided with three jumpers, which
can short circuit the associated pins.
All three jumpers are fitted in the factory, which means that the
address is the same on all units.
Move one or more pins if more than one m2+ is fitted.
The address range is 1 to 7.
Make a note of the address. It will be used later on, when the
AK-SM 350 has to be set up.
Gas detector, type GD
If a type GD gas detector is used, it must be connected to the
"TP" data communication.
For assembly and connection, please see literature sheet
RD7HA.
Set the address in the gas detector (max. no. of addresses is 65).
An address used by an m2+ unit or an EKC controller must not
be duplicated. Make a note of the address. It will be used later
on, when the AK-SM 350 has to be set up.
Address / Adresse
1 2 3 4 5 6 7
EX1 X X X X
EX2 X X X X
EX3 X X X X
Factory setting
X=Mounted
The actual installation of the data communication cable must
comply with the requirements mentioned in the document
"Data communication between ADAP-KOOL® Refrigeration
controls". Literature sheet number = RC8AC.
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