
EKO INSTRUMENTS CO., LTD. - Pyranometer MS-60/60S - Instruction Manual Ver. 4
Pg. 34
A - 4 . C o n f i g u r a t o r S o ft w a r e [ M S - 6 0 S M o d b u s RT U ]
Communication data format is determined by the Modbus protocol.
Table A-4. Communications Specifications
※
1: The open protocol for the serial communication which is developed by Modicon.
※
2: When there is no parity bit, stop bit will be 2 bits; for other cases, stop bit will be 1 bit.
Specification
Details
Telecommunication Standard
EIA RS-485
Topology
Multi-drop [Master: 1, Slave: 100, Total: 100]
Communication protocol
Modbus slave RTU
※
1
[Slave]
Communication speed [baud rate]
2400, 4800, 9600, 19200 [Default], 38400, 115200 bps
Data Length
8bits
Stop Bit
1bit [Default] / 2bits
※
2
Parity Bit
None [Default] / odd / even
Communication Distance
Maximum 1.2km [theoretical value]
Error Detection
CRC-16
※
1: The open protocol for the serial communication which is developed by Modicon.
※
2: When there is no parity bit, stop bit will be 2 bits; for other cases, stop bit will be 1 bit.
Table A-5. Data Format
Start
Address
Function
Data
CRC
End
T1-T2-T3-T4
A silent interval
[
≧
3.5 char]
16bit
8bit
n * 8bit
16bit
T1-T2-T3-T4
A silent interval
[
≧
3.5 char]
Table A-6. Function Code
Table A-7. Data Contents
Data type
Overview
UINT16
Without code, 16bit integer value
SINT16
With code,
16 bit integer value
UINT32
Without code,32 bit integer value
SINT32
With code,32 bit integer value
FLOAT32
IEEE754 32bit Single precision floating
point
STR
A string[ASCII Code]
Code: decimal
Function
03
Read Holding Registers
Modbus Data [RTU]