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15. Modbus communication
The Modbus communication is a serial interface used for standard RS-485 communication.
The communication with the instrument supported with the Modbus communication can be done
without program.
- Modbus is a registered trademark of the Modicon Inc.
The data communication with CSD-903 does not have to make the program of the communication
protocol because it can be operated with the mapped memory operation in the table below.
When using the Modbus communication, set as shown in [14-3.Item of RS-485 communication
setting] as below.
Standard RS-485 should be used as hardware of communication.
Moreover, as for decimal point addition, the terminator, and communication delay time, the setting
will become in VALID since they have no relation with the Modbus operation.
Item Set
value
Operation mode
Modbus
Baud rate
Make selection from 1 200 bps,2 400 bps,4 800 bps,
9 600 bps, 19 200 bps and 38 400 bps.
Data bit length
8 bit
Parity bit
Selection from no parity, even parity, and odd parity
Stop bit
Select from 1 bit and 2 bit.
Address
Select one from 0 to 31.
However, 0 is the broadcast address
・
The standard RS-485 interface and Modbus communication cannot be used when the optional
communication either of RS-232C, RS-422, RS-485 or CC-Link is equipped with Communication and
Modbus communication, and optional RS-232C communication, and RS-422 communication, and
RS-485 communication, and CC-Link communications are not interlocked each other.
・
Function F-45 shall be applied with more than the value of [01].
・
Please set the delay time of 5 ms or more to host side.
・
To use the brand number in Modbus communication holding register [53249], set function F-51 to
[2]. To use the F-52 brand selection settings [57447 to 57448], set function F-51 to [0].
Output coil (Bit, Reading out/Writing, Reference 0)
Address
Data name
Address
Data name
1 ZERO 13
UNUSED
2 ZERO
CLEAR
14
EMERGENCY
STOP
3 TARE 15
UNUSED
4
TARE CLEAR
16
FORCED BATCH FINISH
5 FLOW
START
17
UNUSED
6
UNUSED
18
FORCED DISCHARGE FINISH
7
DISCHARGE START
19
ERROR RESET
8 UNUSED 20
CHANGE
OF
HOLD/HOLD
RELEASE
9
MANUAL FREE FALL COMPENSATION
21
PRINT COMMAND
10 ACCUMULATION
COMMAND
22
GROSS/NET CHANGEOVER
11
CLEAR THE LAST ACCUMULATED DATA
23
ALL BRAND ACCUMULATION CLEAR
12 UNUSED 24
UNUSED
Содержание CSD-903-EX
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