Modbus® Protocol On The Uey Boards; Exceptions Managed - Carel humiSteam UE005 User Manual

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11.11 Modbus® protocol on the UEY boards
The Modbus® protocol can be selected using parameter C7 (see "Serial
connection parameters").
Chapter 7 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:
certain number of "Coil" variables (binary, 1 bit), starting from the specified
address. Broadcast mode is not allowed.
•
MB_READ_INPUT_STATUS 2:
•
MB_READ_HOLDING_REG 3:
block of "Register" variables (numeric, 16 bit). Broadcast mode is not
allowed .
•
MB_READ_INPUT_REG 4:
operationally identical to the above.
•
MB_FORCE_SINGLE_COIL 5:
variable (binary, 1 bit) to ON or OFF (specifying the address of the bit in
question). Broadcast mode is allowed.
•
MB_PRESET_SINGLE_REG 6:
"Register" variable (numeric, 16 bit). Broadcast mode is allowed.
•
MB_FORCE_MULTIPLE_COIL 15:
block of "Coil" variables (binary, 1 bit) (specifying the number of bits and
number of bytes). Broadcast mode is allowed
•
MB_PRESET_MULTIPLE_REG 16:
block of "Register" variables (numeric, 16 bit). Broadcast mode is allowed.

11.12 Exceptions managed

01 illegal function
02 illegal data address
03 illegal data value
"UE BASIC" +08C0042EZ - rel. 1.0 - 16.10.2017
used to request the status (ON or OFF) of a
operationally identical to the above.
used to request the value of a consecutive
used to set the status of an individual "Coil"
used to set the value of an individual
used to set the status of a consecutive
used to set the value of a consecutive
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