Alstom i4MC - APPENDIX A: DATA TYPES DECODING; Data Type Definitions (T1-T17)

User Manual i4MC&V/EN M/C
iSTAT i4MC&V Page 30
9. APPENDIX A: MODBUS COMMUNICATION PROTOCOL
Modbus is enabled via RS232 and RS485 (not USB). The response is the same type as the
request.
Two versions of MODBUS register tables are available:
VERSION 1: Compatibility with advanced family of transducers (i500)
VERSION 2: Compatibility with previous family of transducers (i400)
Modbus protocol enables operation of device on Modbus networks. For device with serial
communication the Modbus protocol enables point to point (for example Device to PC)
communication via RS232 communication and multi drop communication via RS485
communication. Modbus protocol is a widely supported open interconnect originally designed
by Modicon.
The memory reference for input and holding registers is 30000 and 40000 respectively.
VERSION1: i500 compatible
Register table for the actual measurements for i4MV
MODBUS
Register
Parameter
Start End
Type
Frequency 30105 30106 T5
U1 30107 30108 T5
U1 THD% 30182 T16
Internal Temperature 30181 T17
Register table for the actual measurements for i4MC
MODBUS
Register
Parameter
Start End
Type
Frequency 30105 30106 T5
I1 30126 30127 T5
I1 THD% 30188 T16
Internal Temperature 30181 T17
DYNAMIC DEMAND VALUES
I1 30502 30503 T5
MAX DEMAND SINCE LAST
RESET
I1 30518 30519 T5