SIMPRO-100
Modbus
™
RTU Communications Protocol
C
PRIM-2400C
161
C.3
01h Read Coil Status
Command
Use function code 01h to read the On/Off status
of selected bits (coils). You may read the status of
up to 2000 bits per query. Note that the relay
addresses inputs from 0. The relay returns 8 bits
per byte, most significant bit first, with zeroes
padded into incomplete bytes.
Table C.4
01h Read Coil Status Command
To build the response, the relay calculates the
number of bytes required to contain the number
of bits requested. If the number of bits requested
is not evenly divisible by 8, the relay adds one
more byte to contain the balance of bits, padded
by zeroes to make an even byte.
C.4
02h Read Input
Status Command
Use function code 02h to read the On/Off status
of selected bits. You may read the status of up to
2000 bits per query. Note that the relay
addresses inputs from 0. The relay returns 8 bits
per byte, most significant bit first, with zeroes
padded into incomplete bytes.
Table C.5
02h Read Input Status Command
To build the response, the relay calculates the
number of bytes required to contain the number
of bits requested. If the number of bits requested
is not evenly divisible by 8, the relay adds one
more byte to contain the balance of bits, padded
by zeroes to make an even byte.
Bytes
Field
The Master Request must have the Following Format
1 byte
Slave address
1 byte
Function code (01h)
2 bytes
Address of the first bit
2 bytes
Number bits to read
2 bytes
CRC-16 for message
A Successful SIMPRO-100 Relay Response will have
the Following Format
1 byte
Slave address
1 byte
Function code (01h)
1 byte
Byte count
n bytes
Byte count bytes of data
2 bytes
CRC-16 for message
Bytes
Field
The Master Request must have the Following Format
1 byte
Slave address
1 byte
Function code (02h)
2 bytes
Address of the first bit
2 bytes
Number bits to read
2 bytes
CRC-16 for message
A Successful SIMPRO-100 Relay Response will have
the Following Format
1 byte
Slave address
1 byte
Function code (02h)
1 byte
Byte count
n bytes
Byte count bytes of data
2 bytes
CRC-16 for message
Summary of Contents for SIMPRO-100
Page 1: ...SIMPRO 100 Motor Protection Relay Instruction Manual Document No PRIM 2400C ...
Page 12: ...Contents SIMPRO 100 x PRIM 2400C ...
Page 16: ...Contents SIMPRO 100 xiv PRIM 2400C ...
Page 42: ...3 SIMPRO PC Software SIMPRO 100 40 PRIM 2400C ...
Page 100: ...6 ASCII Serial Port Operation SIMPRO 100 98 PRIM 2400C ...
Page 127: ...SIMPRO 100 Event Analysis 9 PRIM 2400C 125 Figure 9 2 Example SER Report ...
Page 136: ...10 Maintenance Troubleshooting SIMPRO 100 134 PRIM 2400C ...
Page 138: ...A Firmware Versions SIMPRO 100 136 PRIM 2400C ...
Page 206: ...D SIMPRO PC Compatibility Features SIMPRO 100 204 PRIM 2400C ...
Page 214: ...E Motor Thermal Element SIMPRO 100 212 PRIM 2400C ...
Page 230: ...F SIMPRO 100 Relay Settings Sheets SIMPRO 100 228 PRIM 2400C ...
Page 239: ......