Auber Instruments SYL-53X2P Supplementary Manual

AUBER INSTRUMENTS
Instruction Manual
CAUTION!
This controller is intended to control equipment under normal operating conditions. If failure or malfunction of it could lead to an abnormal operating
condition that could cause personal injury or damage to the equipment or other property, other devices (limit or safety controls) or systems (alarm
or supervisory) intended to warn of or protect against failure or malfunction of the controller must be incorporated into and maintained as part of the
control system.

1. Introductory

This controller is using RS485 Modebus_RTU (Remote Terminal Unit) mode for the data transfer. Up to 255 meters can be connected at same time.
The format for each byte in RTU mode is:
Coding system:
8-bit binary, hexadecimal 0-9, A-F
Two hexadecimal characters contained in each 8-bit field of the message
Bits per Bytes:
Baud rate (bps): 1200, 2400, 4800 and 9600
Stop bit: 1 bit
Data length: 8 bits
Parity check: None
Error Check Field: Cyclical Redundancy Check (CRC-16)
Other spec when use third party PLC/comm software
Timeout interval: 300ms.
Retries: >2 times

2. RTU Message Frame:

A typical message frame is shown below.
Table 2.1 RTU data frame.
Target address field: This field contains 8-bit data (RTU). Its range is 0 - 255 decimal. Address 0 is for broadcasting data to all receiving devices. To
contact a PID controller, the sender unit/computer/PLC will put the address of that PID controller in the address field of the message. When that
PID controller replies, it will put its address in the address field of the message as well.
Function field: This field contains 8-bit data. Its range is 1 - 64 decimal. This function field will tell what operations are requested for this data frame.
For example, updating the value for set temperature, fetching the current reading temperature, etc.
Data field: This field contains multiple 8-bit data. It contains all the additional information, which is needed to complete the requested function. Such
as the target parameter address, or the new set temperature.
CRC: 16-bit or two 8-bit bytes for error checking. Cyclical Redundancy Check (CRC) value is appended to the end of this data frame. Low-order
byte will be sent in prior to the high-order byte. For example, if the data frame is 010310010001, and its CRC16 is D10A. So its complete data
frame is 010310010001D10A.
Note: RTU message is in hexadecimal format.
2020.09
Supplementary Manual for SYL-53X2P
(RS-485/Modbus_RTU)
Version 1.2 (Sep, 2020)
Target Address Function
8 Bits 8 Bits
Data CRC-16
n x Bits 16 Bit
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