Serial Ports; 1) Standard Serial Port - ABB ANR96 User Manual

ANR96 - USER MANUAL
8.4)

SERIAL PORTS

The instrument has a serial port that can be used as RS485 or RS232. Optionally it's possible to have
another RS485 port or a Profibus port (ANR96PRF model) or an Ethernet port (ANR96LAN model) or
an Ethernet port with a RS485 port.
8.4.1) STANDARD SERIAL PORT
Through the combination of an asynchronous serial RS485 and RS232 communication line it is
possible to exchange information between the instrument and PC, PLC or other compatible systems.
All transmitted characters are in ASCII (American Standard Code for Information Interchange) format.
RS485 allows a multi-drop connection, in order to link-up several instruments on the same network, on
the other hand RS232 allows a single point connection.
This last connection must be carried out when both systems are turned off and disconnected from the
power line, in order to avoid damages on the serial output.
RS232 may be 9 or 25 pin connection, please follow up the enclosed table:
Signal
DCD
RX
TX
DTR
GND
DSR
RTS
CTS
RI
The maximum suggested length of a RS 485 connection is about 1200 mt., while for a RS232
connection about 5 mt.
For longer distances, cables with low attenuation, or connection to line amplifier are recommended.
Up to maximum 32 units can be wired on the same serial line (RS485), exceeding this number it is
imperative to insert a signal repeater, each repeater can manage up to 32 instruments.
The polling time is directly proportional to the instruments number connected on the same serial line.
Description
Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Signal GrouND
Data Set Ready
Request To Send
Clear To Send
Ring Indicator
DB9 DB25
1
2
3
4
5
6
7
8
9
-26-
ANR96
8
3 2
2 1
20
7 3
6
4
5
22