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CN8-SWÔ UserÕs Guide
2-2
2.2 Connecting Controllers and the Computer to the Network
2.2.1 Introduction
The manual supplied with each controller identifies the terminals to be used for RS-232
or RS-485 communications. Consult those manuals before attempting to connect the
controllers to the network.
2.2.2 RS-232 Interface
Follow the instructions in the controller manual for making an RS-232 connection to the
instrument. Refer to the diagram below to see how an adapter should route signals to
and from the computerÕs serial port.
RS-232 Communication:
One-to-one connection between the controller and an RS-232 port
13 14
11 12
1
2
3
4
5
6
7
8
9
10
TxRx
Computer
DB25 DB9
2 TX 3
3 RX 2
7 GND 5
Use a DB25 male or DB9 female
connector.
Gnd
Less than 50 ft.