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ROC827 Instruction Manual
Issued Mar-06 Communications 5-2
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.
LOI (Local Port)
EI
A
-232
(
RS-232D
)
Built-in Ethernet (Comm1)
Built-in EIA-232
(RS-232) (Comm2)
Optional Comm 3 or Comm 4
(
Slot #2
)
Optional Comm 3 to Comm 5
(Slot #3)
Optional Comm 3
(
Slot #1
)