westermo Merlin 4700 Series Cellular Router User Guide
1
8
Figure 6. Pin numbering of serial port
RS-232 ports
When you configure a serial port to operate as an RS-232 interface, it supports the following signals:
• Transmit Data
• Receive Data
• CTS
• RTS
• DSR
• DTR
The pin numbering of the RJ45 socket, when viewed from the front of the unit, is as shown below. The RS-232
interface is wired as a DCE.
Illustration
Pin no.
Signal
DSR
DCD
DTR
SG
Direction
Description
Data Set Ready
1
8
1
2
3
4
5
6
7
8
Out
Out
In
Data Carrier Detect
Data Terminal Ready
Signal Ground, not chassis ground
Receive Data
-
RD
Out
In
TD
Transmit Data
CTS
RTS
Out
In
Clear To Send
Request To Send
Table 4. RS-232 connection
RS-485 ports
When you configure a serial port to operate as an RS-485 interface, it supports both two-wire (half-duplex) and
four-wire (full-duplex) modes. Configuration between two-wire and four-wire RS-485 modes is under software
control. The pin-numbering of the RJ45 connector in RS-485 mode, when viewed from the front of the unit, is
shown below.
Illustration
Pin no.
Signal
Direction
Description
Four-wire mode
Two-wire mode
1
8
1
2
3
R-
T-
-
In
Four wire: Receive
Four-wire: Transmit
T-/R-
Out/In
Two-wire: Transmit/Receive
4
5
6
R+
T+
In
Four-wire: Receive
Four-wire: Transmit
T+/R+
Out/In
Two-wire: Transmit/Receive
7
8
Table 5. RS-485 port pinout
12
Merlin 4700 Series
| General | Details |
|---|---|
| Name | westermo Merlin 4700 Series Cellular Router User Guide |
| Make | westermo |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.84 MB |
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