Chapter Three
Installation
MAN_105G_1.5
Page
28
DIO 1
The output circuit is connected to the appropriate "DIO" terminal. Each digital output circuit
includes a LED indicator which is lit when the digital output is active.
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 data-bus 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 Pinout
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 indicator - not connected
905U-C
DB9
905U-C
DB9