User manual

105G Wireless Gateway User Manual
Elpro_man_105g_1.18.doc Page 34
3.5 Serial Port
3.5.1 RS232 Serial Port
The serial port is a 9 pin DB9 female and provides for connection to a terminal or to a PC for
configuration, field testing and for factory testing. It is also used by the Modbus/DF1 version for
fieldbus connection.
This port is internally shared with the RS485 - ensure that the RS485 is disconnected before
attempting to use the RS232 port. Communication is via standard RS232 signals. The 105G is
configured as DCE equipment with the pinout detailed below.
DB9 Connector Pinouts:
Pin Name Direction Function
1 DCD Out
Used for "active" signal.
2 RD Out Serial Data Output
3 TD In Serial Data Input
4 DTR In
Data Terminal Ready - may be used by Host Protocol Driver
5 SG Signal Ground
6 DSR Out Data Set Ready - always high when unit is powered on.
7 RTS In Request to Send - may be used by Host Protocol Driver
8 CTS Out Clear to send - may be used by Host Protocol Driver
9 RI Ring indicate - not connected
Hardware handshaking using the CTS/RTS lines is provided, and are under the control of the
Host Comms Driver. Example cable drawings for connection to a DTE host (a PC) or another DCE
host are detailed below:
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
2
3
5
7
8
6
4
1
2
3
5
7
8
6
4
1
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
2
3
5
7
8
6
4
1
2
3
5
7
8
6
4
1
DCE HOST
DB9
MALE
DCE HOST MODEMMODEM
DB9
MALE
DB9
MALE
DB9
FEMALE
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
RD
TD
SG
RTS
CTS
DSR
DTR
DCD