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ROC800-Series Instruction Manual
5-2
Communications
Revised Jul-14
the backplane. The ROC800 can hold up to three communication
modules in the first three module slots. Refer to
Figure 5-1
.
A
LOI (Local Port) EIA-232 (RS-232D)
B
Built-in Ethernet (Comm1)
C
Built-in EIA-232 (RS-232) (Comm2)
D
Optional Comm 3 (Slot #1)
E
Optional Comm 3 or Comm 4 (Slot #2)
F
Optional Comm 3 to Comm 5 (Slot #3)
Figure 5-1. Communication Ports
Table 5-2. RS-232 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 communication module has surge protection in accordance with
the CE certification EN 61000. With the exception of the EIA-232 (RS-
232) module, every communication module is isolated from other
modules and the backplane, including power and signal isolation. The
A
B
C
E
F
D