Manuale d’uso - MCM260X - 35
9 Modbus RTU
Depending on the type of flashing, the RUN LED indicates all the operating statuses of the Modbus
RTU protocol.
RUN LED flashing Type of flashing
Blink_fast Rapid flashing at 50msec
Blink_medium Flashing at 200msec
Blink_slow Flashing at 600msec
LED_on LED always on
Blink_3_on LED on for 1sec, 3 flashes for 150msec
Blink_1_off Slow flashing of 40msec every 1.2sec
Blink_3_off LED off for 1sec, 3 flashes for 150msec
Status RUN LED flashing
Boot-up Blink_fast
Normal operating module LED_on
Off-line signal Blink_medium
9.1 Characteristics of the Modbus RTU slave protocol
The support provided for the slave Modbus RTU mode is an isolated RS485 serial with the possibility of
activating the line terminator from 120 to 100 ohm automatically from the parameter.
The automatic line terminator is active only if the module is switched on.
Baud-rate
It can be selected from the parameter
2400 bits/s 28800 bits/s
4800 bits/s 38400 bits/s
9600 bits/s 57600 bits/s
19200 bits/s 115200 bits/s
Format
It can be selected from the parameter
8, n, 1 (8bit, no parity, 1 stop)
8, o, 1 (8bit, odd parity, 1 stop)
8, e, 1 (8bit, even parity, 1 stop)
8, n, 2 (8bit, no parity, 2 stop)
8, o, 2 (8bit, odd parity, 2 stop)
8, e, 2 (8bit, even parity, 2 stop)
Functions supported
WORD READING (max. 50 word) (code 0x03, 0x04)
SINGLE WORD WRITING (code 0x06)
MULTIPLE WORD WRITING (max 50 word) (code 0x10)
9.2 Modbus RTU communication areas
9.2.a MCM260X-1AD, MCM260X-2AD, MCM260X-3AD, MCM260X-4AD
Modbus
address
Description
Read
Write
Reset
value
0
Device type
It contains the device identification code
521: MCM260X-1AD, 522: MCM260X-2AD
523: MCM260X-3AD, 524: MCM260X-4AD
RO
1
Firmware version
It contains the device firmware version
RO
2
Boot version
It contains the device boot program version
RO
3
Compatibility with old MCM260
Indicates whether the device is running in compatibility mode with the
old MCM260 series active (1) or not (0)
R/W
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