EKO MS-60, Instruction Manual, Page: 35 / 45

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]