Westermo Merlin 4100 Series Cellular Router User Guide
3.4.2. Serial Port
Merlin 4100 has a dual-use legacy port that is configurable in software to act either as an RS232 port or
as a digital input. The serial port is named as follows, also the identifier for use within the terminal server
configuration when the port is configured to operate as RS-232:
Label tservd.port.serialPortName
S1
serial1
Figure 4. 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 3. RS-232 connection
Digital input
When you configure the port to operate as a digital input, it operates as a dry contact only.
The pin numbering of the RJ45 socket, when viewed from the front of the unit, is as shown below.
Illustration
Pin no.
Signal
+ve
Direction
Description
Input
1
8
2
3
4
Out
In
-ve
Input. Default value is zero when nothing is fitted to port
Signal Ground, not chassis ground
Ground
-
Table 4. Digital input port
10
Merlin 4100 Series
| General | Details |
|---|---|
| Name | Westermo Merlin 4100 Series Cellular Router User Guide |
| Make | westermo |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.78 MB |
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