3-5
IM XL100C-E
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App
Index
Serial Interface
3.2
RS-485 Interface Specifications and Setup
Procedure
Specifications
Item
Specifications
Terminal block type
Number of terminals: 6, terminal attachment screws:
ISO M4/nominal length of 6 mm
Electrical and mechanical specifications
Conforms to the EIA-485 (RS-485)
Connection type
Multi-drop (1:32)
Transmission mode
Half-duplex
Synchronization
Start-stop synchronization
Baud rate
Select 2400, 4800, 9600, 19200, 38400, 57600, or
115200 bps
Start bit
Fixed to 1 bit
Data length
Select 7 or 8 bits
Parity
Select Odd, Even, or None (no parity).
Stop bit
Fixed to 1 bit
Received buffer length
2047 bytes
Escape sequence
Open and close
Electrical characteristics
Three terminals, SG, +, and –
Communication distance
Up to 1.2 km (when using two shielded twisted-pair
cables, AWG 24)
Terminator
External: 120
Ω
recommended, 1/2W (connect
externally between the + and – terminals)
• RS-485 Terminal Arrangement and Signal Names
SG
Signal Name
Meaning
+
Data (+).
–
Data (–).
SG (Signal Ground)
Signal ground.
Connection Procedure
Up to 31 stations can be connected to a host calculater. The following figure shows an
example when connecting to a PC.
RS-232 / RS-485
Converter
+
–
SG
SG
XL100
PC
RS-232
Terminator ON
Connect a 120
Ω
terminator
Communication cable
Communication cable
Pair
Up to 31 stations
XL100
XL100
SG
SG
SG
SG
SG