ATR 421 - User manual 29
Pressing red display visualizes Lo a d. Con rm with
O
K
. Controller
loads news values and restarts.
• With the controller not connected to the power
supply:
The memory card is equipped with an internal
battery with an autonomy of about 1000 uses.In-
sert the memory card and press the programming
button. When writing the parameters, led turns red
and on completing the procedure it turns to green.
It is possible to repeat the procedure without any
particular attention.
Updating Memory Card
To update the memory card values, follow the procedure described
in the rst method, setting ---- on red display so as not to load the
parameters on controller
3
. Enter con guration and change at least one
parameter. Exit con guration. Changes are saved automatically.
9 Serial communication
ATR421-12ABC-T is provided with isolated RS485 serial and can receive/tran-
smit data via MODBUS RTU protocol. Device can be con gured as master or
slave.
Modbus RTU protocol features
Baud-rate
Selectable by parameter 78
bd.rt.
4.8 k 4800 bit/sec 9.6 k 9600bit/sec
19.2k 19200bit/sec 28.8k 28800bit/sec
57.6k 57600bit/sec 11 5 . 2 11520 0 bit /sec
Format
Selectable by parameter 79
se.p.s.
8. n .1 8 data bits, no parity, 1 stop bit.
8. o .1 8 data bits, odd parity, 1 stop bit.
8. e.1 8 data bits, even parity, 1 stop bit.
Supported
functions
WORD READING (max 20 word) (0x03, 0x04)
SINGLE WORD WRITING (0x06)
MULTIPLE WORDS WRITING (max 20 word) (0x10)
3
If at starting controller shows memo it means that no data are stored into the Memory Card,
however values can be update.
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