3-5
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3-2 System Configurations
3-2-4 Connection using RS-232C and RS-485 ports (2)
This configuration connects to external devices using the RS-232C port and RS-485 port.
RS-485 port
Signal conversion
RS-485
RS-232C
<Mode selection switch: “0”>
RS-232C port
Yes
General purpose device
General purpose device
External device
External device
A
(personal computer, etc.)
External device External device
BCD
CPU
Power
supply
RS1
With this configuration, the following communications can be performed :
1) Communication between external device A and external device B, C or D (not via the CPU module)
2) Communication between external device A and CPU module
3) Communication between external device B, C or C and CPU module
<1) Communication between external device A and external device B, C or D>
This communication is performed directly, namely not via the CPU module.
RS-485
External device
External device
A
(personal computer, etc.)
External device External device
BCD
Transmission speed is 38400 bps (default) for
both RS-232C and RS-485. Changing
transmission speed is done through the user
program (expansion FB).
RS-232C
CPU
Power
supply
RS1
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