User Manual For - CONTROLLER/DATA RECORDER MultiCon CMC-99/141
The answer:
ADDR FUNC BYTE C DATA H1,L1 DATA H2,L2 DATA H3,L3 CRC L,H
01 03 06 00 0A 00 02 00 00 18 B4
DATA H1, L1 - 401h registry (10 – high word of value for channel 1, no decimal point),
DATA H2, L2 - 402h registry (2 – low word of value for channel 1, no decimal point),
DATA H3, L3 - 403h registry (0 – status for channel 1).
There is no full implementation of the Modbus Protocol in the device. The functions
presented above are the only ones available.
7.15.3. Modbus - MASTER mode
The parameters of a
Modbus
protocol for the
MASTER
mode are:
–
Mode
=
MASTER
,
–
Baud rate
- this parameter allows the user to select the baud rate RS-485 interface,
available option:
1200
,
2400
,
4800
,
9600
,
19200
,
38400
,
57600
,
115200
bit./sec.,
–
Format
- data format of the RS-485 interface, available options are shown in
Tab. 7.10
.
Format Number of data bits parity control Number of stop bits
8N1
8 none 1
8N2
8 none 2
8E1
8 even 1
8E2
8 even 2
8O1
8 odd 1
8O2
8 odd 2
Tab. 7.10 Data format of the RS-485 interface
–
Request timeout
- is the amount of time (any value between 0.01 to 3 sec.) the
Master device waits for a response from the Slave device after sending a query,
–
Request retrials
- this is the number of times (integer value between 1 to 5) a
Master device tries to send a message,
–
Interval
– minimal amount of time that elapses between read/write cycles. The
read/write cycle contains all the operations with Slave devices. If the Master device
requests all the Slave devices in shorter time than the interval, then new requests will
begin after the Interval elapses.
–
Slave device
- this Button enters the submenu that allows to define the list of Slave
devices connected to the current serial port of MultiCon and configure registers for
read and/or write. See below for more information on this menu.
SLAVE device
menu
242
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