Communication
11.1 Communication via Modbus
SIWAREX WT241
Manual, 05/2015, A5E36046748Aa 95
11.1.4 Command mailboxes
Corresponding command codes must be sent in order to execute commands and to read
and write data records in the Modbus buffer memories. These are described in more detail in
chapter → Command lists (Page 87). The following tables list the Modbus registers used to
process these commands:
Table 11- 1 Command mailbox 1: Highest priority
Code of command to be executed
Trigger for starting the command
0=job running; 1=job finished (1 cycle)
0=no error; <>0=error code
Table 11- 2 Command mailbox 2: Average priority
Code of command to be executed
Trigger for starting the command
0=job running; 1=job finished (1 cycle)
0=no error; <>0=error code
Table 11- 3 Command mailbox 3: Low priority
Code of command to be executed
Trigger for starting the command
0=job running; 1=job finished (1 cycle)
0=no error; <>0=error code
11.1.5 Reading registers
The method for reading registers depends on whether they belong to the writable data
records (DR 3 to DR 29) or can only be read as current values (DR 30 to DR 34).
If you wish to read the registers from the data records DR 3 to DR 29, you must first export
these as a complete data record to the internal output buffer.
All Modbus registers of the individual parameters can be found in chapter → Scale
parameters and functions of the belt scale (Page 59).
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