12-7
COM port (For L40MR and L60MR types)
Item Specifications
Interface RS485
Communication mode 1:N communication
Transmission distance Max. 1200 m
Note1) 2)
Baud rate 19200, 115200 bps
Note2) Note3)
Communication method Two-wire, half-duplex transmission
Synchronous method Start stop synchronous system
Transmission line Multicore shielded line
Trans-
mission
code
Computer link ASCII
General-purpose
serial communication
ASCII, Binary
Communication
format
(to be set by
system register)
Note4)
Data length 7 bits/8 bits
Parity None/Even/Odd
Stop bit 1 bit/2 bits
Start code STX/No STX
End code CR/CR+LF/None/ETX
No. of connected units
Note2) Note5)
Max. 99 units (32 units max. when C-NET adapter is connected.)
Communication functions
Computer link (master/slave)
Modem initialization
General-purpose serial communication
Modbus RTU (master/slave)
PC(PLC) link
Note1) When connecting a commercially available device that has an RS485 interface, please confirm
operation using the actual device. In some cases, the number of units, transmission distance, and
baud rate vary depending on the connected device.
Note2) The values for the transmission distance, baud rate and number of units should be within the
values noted in the graph below.
Note3) The settings of the baud rate switches on the side of the unit and the system register No. 415
should be the same. Only 19200 bps can be specified when the C-NET adapter is connected with
the RS485 interface.
Note4) The start code and end code can be used only in the general-purpose serial communication
mode.
Note5) Unit numbers should be registered by the system register.
Factory default settings
Port type Baud rate Data length Parity Stop bit
Tool port 9600 bit/s 8 bits Odd 1 bit
COM port 115200 bit/s 8 bits Odd 1 bit
Note:
As it is the non-isolated type, the potential difference between the power supplies of RS485 devices
should be 4 V or less. If it exceeds 4 V, the unit may not communicate. The large potential difference
leads to the damage to devices.
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