17: USER COMMUNICATION INSTRUCTIONS
17-2 « FC4A MICROSMART USER’S MANUAL »
User Communication Mode Specifications
Note *: WindLDR 4.0 or higher is needed to use these BCC calculation formulas.
Connecting RS232C Equipment through RS232C Port 1 or 2
When using port 2 for RS232C communication on the all-in-one 16- or 24-I/O type CPU module, install the RS232C com-
munication adapter (FC4A-PC1) to the port 2 connector.
When using port 2 for RS232C communication on the slim type CPU module, mount the RS232C communication module
(FC4A-HPC1) next to the CPU module.
When using port 2 for RS232C communication on the slim type CPU module with the optional HMI module, install the
RS232C communication adapter (FC4A-PC1) to the port 2 connector on the HMI base module.
To connect an RS232C communication device to the RS232C port 1 or 2 on the MicroSmart CPU module, use the user
communication cable 1C (FC2A-KP1C). One end of the user communication cable 1C is not provided with a connector,
and can be terminated with a proper connector to plug in to communicate with the RS232C port. See the figure on
page 17-3.
Type RS232C User Communication RS485 User Communication
Communication Port Port 1 and Port 2 Port 2
Connection Device Quantity 1 per port 31 maximum
Standards EIA RS232C EIA RS485
Baud Rate 1200, 2400, 4800, 9600, 19200 bps
Data Bits 7 or 8 bits
Parity Odd, Even, None
Stop Bits 1 or 2 bits
Receive Timeout
10 to 2540 msec (10-msec increments) or none
(Receive timeout is disabled when 2550 msec is selected.)
The receive timeout has an effect when using RXD1/RXD2 instructions.
Communication Method Start-stop synchronization system half-duplex
Maximum Cable Length 2.4m 200m
Maximum Transmit Data 200 bytes
Maximum Receive Data 200 bytes
BCC Calculation XOR, ADD, ADD-2comp *, Modbus ASCII *, Modbus RTU *
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