Emerson ROC827 instruction manual Communication LED Indicator Definitions, Signals Action

ROC827 Instruction Manual

LOI (Local Port) EIA-232 (RS-232D)

Built-in Ethernet (Comm1)

Built-in EIA-232 (RS-232) (Comm2)

Optional Comm 3 (Slot #1)

Optional Comm 3 or Comm 4 (Slot #2)

Optional Comm 3 to Comm 5 (Slot #3)

	Figure 5-1. Communication Ports
	Table 5-2. Communication LED Indicator Definitions
Signals	Action
CTS	Clear To Send indicates the modem is ready to send.
CD	Data Carrier Detect (DCD) indicates a valid carrier signal tone detected.
DSR	Data Set Ready for ring indicator communication signal.
DTR	Data Terminal Ready to answer an incoming call. When off, a connection disconnects.
RTS	Ready To Send indicates ready to transmit.
RX	Receive Data (RD) signal is being received.
TX	Transmit Data (TD) signal is being transmitted.

Each communications module has surge protection in accordance with the CE certification EN 61000. Each communications module is completely isolated from other modules and the backplane, including power and signal isolation, with the exception of the EIA-232 (RS-232) module. The field interface has been designed to protect the electronics in the module. Filtering is provided on each module to reduce communication errors.

Issued Mar-06 Communications 5-2