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ROC827 Instruction Manual
Issued Mar-06 Communications 5-6
Table 5-3. Built-in LOI EIA-232 Signal Routing
Signal LOI Function
RJ-45 Pins
on ROC827
Description
DTR
Data Terminal
Ready
3
Originated by the ROC827 Data Terminal Equipment (DTE) to instruct
the Data Communication Equipment (DCE) to setup 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 the installation of a D-Sub 9 pin (F) to RJ-45
modular converter between the ROC827 and personal computer (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
2 RX 6
7 – 7
8 RTS 8
Table 5-5. Using Cable Warehouse 0378-2 D-Sub to Modular Converter 9-Pin to RJ-45 Black
Pin
Wire
Color
RJ-45 Pins
on ROC800-
Series
1 Blue 4
2 Orange 1
3 Black 6