Modbus - Iom CWAR 01-N-3ALL Manuel D'installation Et De Maintenance

13.9. MODBUS

The MODBUS supervision can be connected to a maximum of 123 appliances.
² The maximum distance between the RCL and the first unit is 30 metres.
² The maximum distance between the RCL and the furthest unit is 100 metres.
The use of the µBMS recall command is not compatible with the modbus communication.
The same terminals and addressing DIPs are used in both connection cases.
100m MAXI
CW-AR 1
CARTE
STORM 2
RS 485
1 2 3 4
12V GND A- B+
1 2 3 4
RCL
- +
RS 485
MODBUS
Shielded twisted pair wire must be used for interconnecting wiring. Wire impedance must be between
100 and 130 Ohms and the wire surface section must be between 0.12 and 0.5 mm² (26 to 20 AWG).
Larger wire may be used, but in this case connection to the terminal blocks can cause problems.
Note : When MODBUS supervision is used, all the units must have a unique address (see "Addressing procedure").
CW-AR 2
CARTE
STORM 2
RS 485
1 2 3 4 1 2
12V GND A- B+
1 2 3 4
RCL
21
CW-AR 3
CARTE
STORM 2
RS 485
3 4
12V GND A- B+
123 CW-AR
MAXIMUM