Chapter 3
Installation
MAN_105G_1.16
Page 34
All eight of the 105G DIO terminals may also be used as discrete outputs. The digital outputs
are transistor switched DC signals, FET output to common rated at 30VDC 500 mA.
Digital outputs may be configured to individually turn off if no command message is received
to that output for a certain period. This feature provides an intelligent watch dog for each
output, so that a communications failure at a transmitting site causes the output to revert to a
known state. See Chapter 4
Configuration
for further details.
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 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 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 indicate - not connected
_
+
DC
Load
Max 30VDC
0.5A
DIO
DIO
GND
105U-G