2. SETTING OF NON-STANDARD INPUT
In parameter
Sens
, equivalent to one of the non-standard inputs (name, starting with
nS
), the device
uses polynomial calibration coefficients 'Non-standard input'. They convert normalized linear input
0-10000
(0-1V, 0-10V, 0-20mA non-standard.), μV(TC non-standard), Ω (RTD400Ω non-
standard), Ω/10 (RTD4KΩ non-standard),
==>
measured quantity
by polynomial degree three.
They are set only via RS485 communication with device, but in advance must be calculated
according to the characteristics of the sensor.
'non-standard' means sensor input with nonlinear transfer characteristic, for which is not pre-defined
in the device, i.e. it is absent from the values of parameter
Sens
. This does not mean that the sensor
does not correspond to an industry standard.
In sensor TC
non-standard
, the device measures the temperature of the cold end, as for all other
thermocouples.
XIII.
RETURNING OF FACTORY SETTINGS
If calibration failed or incorrect configuration parameters it is possible to return the default settings,
by SYST, rE = 1 (hidden system parameters).
Function only applies to certain parameters – hidden, service, calibration of input / output.
XIII.
MODBUS RTU RS485 COMMUNICATION (option)
The device is MODBUS RTU SLAVE with possibility for communication of 9600 or 19,200 bps by
RS485 2WIRE line (parameter
ConF
). In standard performance without using repeaters, on a line can be
connected up to 32 devices, with repeaters — up to 247. There is an option for a special performance for up
to 128 devices without repeaters.
In the parameters table in column HOLDING REGISTER ADDRESS are the addresses of the relevant
parameters. Here will be considered other communication options. When changing the parameter or
operating mode there is an equality between change via the front panel buttons or change by network - ie the
device can be influenced by two sources simultaneously. If the network is a priority you can lock the keypad
(but it can be unlocked through the front panel).
IMPLEMENTED MODBUS FUNCTIONS
MODBUS
FUNCTION
COMMENT. RESTRICTIONS.
Only specified with parameter and quantity names addresses can be used, and undescribed
addresses in the manual should be considered as reserved addresses. The address fields in
the table only indicate that the operation is feasible without EXEPTION (protocol error
message).
01
Reading of single bits.
03
Reading of HOLDING REGISTERS, 0< REG ADR <127 – registers in the non-volatile
memory, 128<REG ADR <256 – registers in RAM. When adding 512 - FLOAT
calibration coefficients should be read in IEEE754 format (otherwise they are in format
EXP, S.B0,B1,B2).
05
Record of single bit, 439<COIL ADR<512; 967<COIL ADR<976
06
Record of single HOLDING REGISTER, 0<REG ADR<127 – in non-volatile memory;
16
Record of many consecutive HOLDING REGISTERS. Action field as a function 06 plus
addresses 512-640. In REG ADR>512 the function is to record the calibration coefficients
FLOAT in IEEE754 format.
Document revision 2015-03-20
21
