Minebea Intec CSD-903, Руководство по эксплуатации

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17 ModBus communication
ModBus communication is a serial interface that uses standard RS-485 communications.
Communication with an instrument supported by ModBus communication can be carried
out without an application.
- Modbus is a registered trademark of Modicon, Inc. -
Data communication with CSD-903 does not require a communication protocol
application because it operates with the mapped memory operation shown in the table
below.
Carry out the settings as shown below, referring to Chapter
16.3 .
Standard RS-485 communications hardware should be used.
Moreover, decimal point addition, termination and communication delay time settings
are invalid as they are irrelevant to ModBus operation.
Item Set value
Operation mode ModBus
Baud rate Can be selected from 1 200, 2 400, 4 800, 9 600, 19 200 and
38 400 bps
Data bit 8 bit
Parity bit Can be selected from [No parity], [Even parity] and [Odd par-
ity]
Stop bit Can be selected from 1 bit and 2 bit
Address Select one from 0 to 31
Note that 0 is a broadcast address.
Note:
-
The standard RS-485 interface and ModBus communication cannot be used when
RS-232C, RS-422 or RS-485 are installed if optional RS-232C communication,
RS-422 communication and RS-485 communication are not interlocked.
- Function F-45 is used if the value is more than [01].
- Set the delay time to 5 ms or more on the 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 read/write reference No. 0)
Address Data name
1 ZERO
2 ZERO CLEAR
3 TARE WEIGHT
4 TARE WEIGHT CLEAR
17 ModBus communication Weight indicator CSD-903
Minebea Intec EN-137