SAES SIP POWER, Руководство пользователя, Страница: 30 / 62

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