Instruction Manual PSx3xxMod
9
Runs which involve specifically a block run (e.g. reference runs on block),
may only be started with reduced torque (max. torque max. 10% of the
nominal torque).
Underwater usage of the PSW is not allowd.
2.7 Modbus
The Modbus
transmission mode “RTU” is used as the protocol at the Modbus
EIA/TIA-485 interface
. The transmission mode “ASCII” is not supported.
The default baudrate is 19200 bps. The supported setting for the serial port is 8-N-2
(8 data bits, no parity, 2 stop bits).
There are up to 32 devices allowed without a repeater.
Implemented function codes:
Function
code (hex)
Sub
code (hex)
Description
0x03
Read holding register
For reading the holding register HR0-HR127
0x06
Write single register
For writing a 16 bit holding register
0x10
Write multiple register
For writing a 32 bit holding register (HR48-49, HR52-53
, …) and
for writing the control word + target value (HR32-34) at once.
0x2B
0x0E
Read device identification
Object id
0x00: VendorName
0x01: ProductCode
0x02: MajorMinorRevision
0x03: VendorUrl
0x80: production date, year and week of manufacturing (YYWW)
0x81: serial number
Response is given as ASCII String
There are several combined registers: Two 16-bit holding registers are combined to a
32-bit value. In order to write these 32-bit values, always first write to the high word,
after that to the low word. After a write access to the low word, the internal 32-bit
value will be changed. Between these two write accesses no other write access to
another register may be requested, otherwise the write access to the low word will be
rejected and answered with an exception code.
