INST.No.INE-863B KR2S
【
Communication Interface
】
Instruction Manual
-7-
4
Communications specifications
4-1
Serial communications
Specifications of the serial communications of this unit are as follows. * mark shows factory default
settings.
Communication system
Half-duplex Start-stop synchronization (polling selecting system)
Protocol
MODBUS protocol
Transmission mode
RTU mode*/ASCII mode
Transmission speed
9600 */19200 bps selectable
Start bit
1 bit
Data length
7 bits/8 bits*(depended on transmission mode)
Parity bit
Non* (none)/Even/Odd(depended on transmission mode)
Stop bit
1 bit*/2 bits(depended on transmission mode)
Transmission code
Binary*( RTU mode)/ASCII(ASCII mode)
(depended on transmission mode)
Error check
CRC-16*/LRC (depended on transmission mode)
Data transmission procedure No procedure
Signals used
Transmission/reception of data only (Control signal not used)
Other
External units precedence communications system
4-2
Ethernet communications
Specifications of the Ethernet communications of this unit are as follows.
Media
Ethernet (10BASE-T/100BASE-TX)
Communications mode
Full-duplex/Half-duplex
Communications speed
10Mbps (10BASE-T)/100Mbps (100BASE-TX)
However, as the communications speed and the communications
mode are automatically recognized, fixed settings are disabled.
Protocol
MODBUS (RTU) protocol on TCP/IP
Number of simultaneous
connection
1 (for high order communications using the MODBUS protocol only)
This unit provides functions of Web, FTP, etc., but this manual describes data communications using
MODBUS communications only.
The relation of the MODBUS communications and TCP/IP layers are shown in the table below.
TCP/IP Model Layers
Main protocols used in
Ethernet communications
Application layer
MODBUS
Transport layer
TCP
Internet layer
IP, ARP
Physical layer/Data link layer
Hardware (Ethernet)
For details of the MODBUS protocol, refer to 7 MODBUS protocol.
Summary of Contents for KR2S
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