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ROC800-Series Instruction Manual
5-6
Communications
Revised Jul-14
direct connection using ROCLINK 800 software to configure and
transfer stored data.
The LOI uses the Local Port in ROCLINK 800 software.
The LOI terminal (RJ-45) on the CPU provides wiring access to a built-
in EIA-232 (RS-232) serial interface, which is capable of 57.6K baud
operation. The RJ-45 connector pin uses the data terminal equipment
(DTE) in the IEEE standard.
The LOI port supports ROC Plus and Modbus protocol communication.
The LOI also supports the log-on security feature of the ROC800 if you
have enabled the Security on LOI in the ROCLINK 800 software.
Table 5-3
shows the signal routing of the CPU connections.
Figure 5-3
shows the RJ-45 pin out.
Table 5-3. Built-in LOI EIA-232 Signal Routing
Signal
LOI Function
RJ-45 Pins
on ROC800
Description
DTR
Data Terminal
Ready
3
Originated by the ROC800 Data Terminal Equipment (DTE) to instruct
the Data Communication Equipment (DCE) to set up a connection.
DTE is running and ready to communicate.
GND
Ground
(Common)
4
Reference ground between a DTE and a DCE and has a value 0 Volts
dc.
RX
Receive
5
Data received by the DTE.
TX
Transmit
6
Data sent by the DTE.
RTS
Request to Send
8
Originated by the DTE to initiate transmission by the DCE.
Figure 5-3. RJ-45 Pin Out
The LOI terminal requires you to install a D-Sub 9 pin (F) to RJ-45
modular converter between the ROC800 and PC. Refer to
Table 5-4
.
Table 5-4. RJ-45 to EIA-232 (RS-232) Null-modem Cable Signal Routing
EIA-232
(RS-232)
DTE
ROC800-
Series
RJ-45 Pins
on ROC800-
Series
4
–
1
1
–
2
6
DTR
3
5
GND
4
3
TX
5