Delta RMC151 - Manual (Page 645)

7 Hardware
The RMC75S combines multiple communication protocols with RS-232 and RS-485 transceiver
options to form a versatile and industrial-hardened communication platform. The RS-232
option provides full-duplex point-to-point communications, while RS-485 allows half-duplex
multi-drop networking with up to 128 RMC70s.
Due to limited throughput of serial communications, the RMC75S is best suited for applications
where time-critical machine control functions related to motion are implemented in the
RMC75S using the User Programs. The serial communications is fine for low-bandwidth
monitoring or modifications to the RMC75S parameters or User Programs. In applications
where higher throughput is necessary, consider the RMC75E Ethernet module.
Features
• One serial RS-232 or RS-485 Communications port
• One serial RS-232 Monitor Port
• Supported Protocols
o Allen-Bradley DF1 (Full- and Half-duplex)
o Modbus/RTU
o Mitsubishi Bidirectional Protocol
Part Number
The part numbers of the RMC75S is RMC75S. Like all RMC70-series CPU modules, the
RMC75S can only be ordered with an axis module.
For example, RMC75S-QA2 is an RMC75S with a two-axis QA2 module.
Specifications
Serial Interface
Transceivers User-selectable: RS-232, RS-485
Baud Rates 9600, 19200, 38400, 57600, 115200 baud
Stop Bits 1 or 2
Data Length 8 bits
Parity None, Odd, or Even
Isolation 500 VAC
Electrostatic Discharge
(ESD) Protection
15 kV
RS-232 Interface
Type Single-Ended
Connector DB-9 Male
Communication
Distance
50 ft (12 m)
Network Type Point-to-Point
RS-485 Interface
Type Differential
Connector 5-pin Terminal Block
Communication
Distance
4000 ft (1200 m)
Network Type RS-485: Point-to-Point or Multi-drop up to 128 nodes
RS-485 Input
Impedance
48 kΩ (1/4 unit load)
Biasing User selectable
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