90
31.4 Double loop: control the gap between processes
To desable this function,
enter 0 (zero) on 3
rd
Digit of
parameter 52
.
During rising or cooling steps, the
controller will monitor the gap
between processes. If this function
is enabled, when the gap is bigger
than value entered on 3
rd
digit of
parameter 52, setpoint is blocked
until the gap becomes lower than
this value.
32 Communication protocol Modbus RTU
32.1 Main features
ATR620 has been conceived for control and communication by
Terminals via Modbus RTU protocol. It is provided with serial port
RS485 for programming of configuration parameters and reading
of analog inputs.
Baud-rate
Selectable by parameters
38400 bits/sec
31250 bits/sec
19200 bits/sec
9600 bits/sec
4800 bits/sec
Format
Selectable by parameters
Default: 8, N, 1 (8bit, no parity, 1 stop)
Supported
functions
BITS READING (0x01, 0x02)
WORD READING (max 1 word) (0x03, 0x04)
SINGLE BIT WRITING (0x05)
SINGLE WORD WRITING (0x06)
MULTIPLE BITS WRITING (0x0F)
MULTIPLE WORD WRITING (max 30 word)
(0x10)
