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XYR301E Wireless Ethernet
User Manual
Page 24
April 2012
2.3
Serial Connections
RS232 Serial Port
The serial port is a 9 pin DB9 female and provides for connection to a host device as well as a PC terminal for
configuration, field testing and for factory testing. Communication is via standard RS232 signals. The XYR301-E is
configured as DCE equipment with the pinouts detailed below.
Hardware handshaking using the CTS/RTS lines is provided. The CTS/RTS lines may be used to reflect the status of
the local unit’s input buffer. The XYR301-E does not support XON/XOFF.
Example cable drawings for connection to a DTE host (a PC) or another DCE hosts (or modem) are detailed above.
DB9 Connector Pinouts
Pin
Name
Direction
Function
1 DCD
Out
Data carrier detect
2 RD
Out
Transmit Data
– Serial Data Output (from DCE to DTE)
3 TD
In
Receive Data
– Serial Data Input (from DTE to DCE)
4 DTR
In
Data Terminal Ready
5 SG
Signal Ground
6 DSR
Out
Data Set Ready
- always high when unit is powered on.
7 RTS
In
Request to Send
8 CTS
Out
Clear to send
9 RI
Ring indicator
DCE HOST
DB9
MALE
MODEM
DB9
MALE
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
2
5
7
8
6
4
1
3
2
5
7
8
6
4
1
3
DCE HOST
MODEM
DB9
MALE
DB9
FEMALE
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
2
5
7
8
6
4
1
3
2
5
7
8
6
4
1
3
Summary of Contents for XYR301E
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