11-6
IM CW120-E
11.2 RS-485
The RS-485 interface allows multiple CW120s and CW121s to be connected
for remote monitoring.
● RS-485 Interface Specifications
Electromechanical specifications: Compliant with EIA RS-485
Topology: Multidrop
Communication method: Half duplex
Synchronization: Asynchronous
Baud rate: 1200, 2400, 4800, 9600, 19200 bps
Start bits: Fixed to 1 bit
Data bits: 7 or 8 bits
Parity: Odd, even, or none
Stop bits: 1 or 2 bits
Connector: 4 screw terminals (M3)
Hardware handshake: Not available
Software handshake: Not available
Error detection: 2-byte simple summation checksum
Reception buffer length: 1024 bytes
Maximum transmission distance: 1.2 km (when using shielded cable
containing 2 twisted pairs of AWG 24
conductors)
Terminating resistor: Approx. 120Ω built-in
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