Installation and Operating Instructions - Crompton Instruments
Installation and Operating Instructions - Crompton Instruments
Installation and Operating Instructions - Crompton Instruments
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SERIAL COMMUNICATIONS<br />
Modbus RTU<br />
Parameter<br />
Values<br />
Media<br />
3 Wire, (A, B, Ground) RS485<br />
Multidrop<br />
32 St<strong>and</strong>ard Loads,<br />
SPR = 1 St<strong>and</strong>ard Load<br />
Protocol<br />
Modbus RTU<br />
Baud Rate 2400/4800/9600/19200<br />
Parity<br />
Odd/Even/None<br />
Stop Bits 1 or 2<br />
Response Time<br />
150 mSec (Max), 80mSec (Typical)<br />
Register Representation 4 Byte IEEE 754, represented as register pairs,<br />
big endian byte order - can be reversed<br />
Functions Supported Read Input Registers ( 04)<br />
Read Holding Registers (03)<br />
Write Holding Registers (16)<br />
Exception Codes Illegal function (01)<br />
Illegal Data Address ( 02)<br />
Illegal Data Value ( 03)<br />
SPECIFICATION APPROVAL<br />
UL <strong>and</strong> CSA recignised File No. E214293<br />
Railtrack Certificate of Acceptance<br />
PA051/1450. Scope: Protective Device<br />
on Signalling Power Supply Systems<br />
94
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