ABB 8241, Operating Instructions Manual, Page: 7 / 28

5
5 SETTING UP
Fig. 5.1 Termination Resistor Links
For all aspects other than serial data transmission the
transmitter is set up as shown in the relevant Instruction
Manual. Unless otherwise requested, the instrument is
despatched with a transmission rate of 9600 baud and
transmission line termination resistors linked-out. If the
resistors are to be linked-in (see Fig. 5.1) carry out the
following Section.
5.1 Termination Resistors – Fig. 5.1
For long transmission lines, termination resistors are required
on the last 8240 Monitor in the chain and at the host computer/
computer terminal. Under normal operating conditions the
resistors are required at the last 8240 receive inputs only – see
Fig. 4.1. The transmitter’s resistors are selected using plug-in
links – see Fig. 5.1.
Switch off the supply and gain access to the output board
–
see
relevant Instruction Manual
.
Set the termination resistor links
as shown in Fig. 5.1.
Output Board
IC32 IC31
IC33
IC34
6
7
1
12
6
7
1
12
Termination
Resistors
IN
Termination
Resistors
OUT