USER MANUAL - SIP POWER ION PUMP CONTROLLER
M.HIST.0109.23 Rev.1 Page 30 of 62
9. Modbus PDU Communication Protocol
9.1. Implementation Notes
Application Layer
Modbus Application Protocol V1.1b3 (PDU)
Implemented functions:
(0x03) Read Holding Registers
(0x10) Write Multiple Registers
Physical Layer
RS-485 EIA/TIA Standard
The inter-frame interval has to be at least 4ms.
According to Modbus specification the power supply does not answer to read requests
directed to broadcast slave ID, ever.
The power supply answers with a illegal function exception to any commands which specify a not
implemented function.
The power supply answers with illegal data address exception to any command which addresses
invalid register(s) or try to read/write write/read-only register(s).
The power supply answers with illegal data value exception to:
any command which spans multiple registers and due to an invalid number of registers
or/and number of bytes fields control reaches an invalid or misaligned register value.
any write command which fails validation.
A single word byte order is the same of the specification: MSB first.
Multi-word word order is least-significant-word first, for instance 32bit value 0x33221100 is
encoded in two consecutive words 0x1100 0x3322.
CRC is encoded with the same byte order of the specification: LSB first.
Multiple adjacent registers can be read or written with a single command.
9.2. Registers Map
Address Word R/W Type Name Description
0x1000 1 R bit-mask CARD_TYPE hardware features
0x1001 1 R unsigned integer HW_CODE hardware revision
0x1002 1 R unsigned integer SW_VERSION software version
0x1003 2 R unsigned integer SERIAL_NUMBER serial number
0x2000 2 R unsigned integer LIFE_TIME total working hours
0x3000 1 R unsigned integer TEMPERATURE internal temperature [K]
0x3001 1 R unsigned integer ARCING_NUMBER number of arcing events from power
supply start
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