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6.8 1:N Communicati on (General-purpose Serial
Communication)
Overview
Multi Communication Unit (MCU) and the external units having unit numbers are connected using an
RS485 cable. Using the protocol that matches the external units, the F159 (MTRN) and F161(MRCV)
instructions are used to send and receive data.
Usable communication blocks
• FP2-CB485 AFP2805 (RS485)
Setting communication format
Settings for COM. port
Item Allowable setting value
Communication mode General-purpose serial communication
Baud rate 2400 to 230400 bps
Character bit 7 bits, 8 bits
Parity Odd, Even, 0 parity, None
Stop bit length 1 bit, 2 bits
RS/CS(only with RS232C) Invalid/Valid
Send waiting time 0 to 100 ms (0.01 ms unit)
Header STX STX not exist/STX exist
Only for
general-purpose
serial communi-
cation
Terminator
cR, cR+Lf, ETX
Timeout (0.01 to 100 ms)
In 0.01 ms unit
Others
Initialize
modem
No/Yes
Note1) The setting must be done according to the devices connected.
Note2) Connect the “-“ terminal and the “E” terminal with a lead wire to make the termination resistance
of the AFP2805 effective.
Reference: For the details on the method to set, <4.4 How to Set>
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