20
EN
“UEX-PLUS” +030220621 - rel. 1.4 - 04.08.2009
installer
user
ser
vice
+ -
GND
connection terminal block
for RS-485 board
Fig. 5.d (detail of the electronic board, humidifi er electrical
compartment)
For the connecting remove the cover , and connect cards optional
connector J19.
M.2
M.7
J19
M.8
Modbus® protocol
The protocol Modbus ® is available by selecting from the menu installer
mask supervisor.
Chapter 13.6 shows a list of variables and the corresponding addresses.
For multiple read/writes, the maximum number of “Register” or “Coil”
variables is 20.
The following functions are available:
MB_READ_COIL_STATUS 1: used to request the status (ON or OFF)
of a certain number of “Coil” variables (binary, 1 bit), starting from the
specifi ed address.
MB_READ_INPUT_STATUS 2:
operationally identical to the above.
MB_READ_HOLDING_REG 3:
used to request the value of a
consecutive block of “Register” variables (nu-meric, 16 bit).
MB_READ_INPUT_REG 4:
operationally identical to the above.
MB_FORCE_SINGLE_COIL 5:
used to set the status of an individual
“Coil” variable (binary, 1 bit) to ON or OFF (specifying the address of the
bit in question).
MB_PRESET_SINGLE_REG 6:
used to set the value of an individual
“Register” variable (numeric, 16 bit).
MB_FORCE_MULTIPLE_COIL15: used to set the status of a consecutive
block of “Coil” variables (binary, 1 bit) (specifying the number of bits and
number of bytes).
MB_PRESET_MULTIPLE_REG16: used to set the value of a consecutive
block of “Register” variables (nume-ric, 16 bit).
Exceptions managed:
01 illegal function
02 illegal data address
Important: for the tLAN and pLAN connections in residential
household (IEC EN 55014-1) and residential (IEC EN 61000-6-3)
environments, use shielded cable (with shield connected to GND). This
warning also applies to the cables leaving the unit.
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