1
1. COMMUNICATION FUNCTIONS
1.1 General
SE series provides a communication function by RS-485 interface, by which it can transmit
and receive data to and from host computer, programmable controller, graphic display panel,
etc.
The communication system consists of master station and slave stations. Up to 255slave
station can be connected per master station.
In order that the master station and slave station can communicate, the format of the
transmit/receive data must coincide. For the SE series, the format of the communication
data is determined by the MODBUS protocol (RTU mode).
Please use an RS-232C
→
RS-485 converter in case of designating a personal computer or
other devices which have an RS-232C interface as a master station.
2. SPECIFICATIONS
2.1 Communication Specifications
Item S
pecification
Electrical specification Based on EIA RS-485
Transmit system
2-wire, semi-duplicate
Synchronizing system Asynchronous mode
Connection format
1 : N
Number connection
unit
Up to 255 units
Transmission distance 500m max
Transmission speed 2400 / 4800 / 9600 / 19200 selectable
Start bit
1 bit
Data length bit
8 bits
Parity bit
None
Data format
Stop bit
2 bits
Transmission code
HEX value (MODBUS RTU mode)
Error detection
CRC-16 bits
Isolation
Functional isolation between transmission circuit
and others (with stand voltage: 500V AC).
A typical MODBUS protocol character is shown below:
1 2 3 4 5 6 7 8 9
10 11
Start bit
Data bits
Stop bits
One character is including 1 Start bit and 8 Data bits and 2 Stop bits.
3. CONNECTION
△
WARNING
For avoiding electric shock and malfunctions, don’t turn on the power supply
until all wiring has been completed.
3.1 Terminal Allocation
SE6000
Terminal number
Signal name
1 +
2 -
