Network Termination At The Aquatrend Interface Without Som - Hach AquaTrend 51200 Instrument Manual

Section 5

5.4.2 Network Termination at the AquaTrend Interface without SOM

Note: To avoid damaging the
instrument, remove power to the
instrument before removing the
front cover.
Figure 25 Network Termination at the AquaTrend Interface Jumper Position Enabled
Page 68
Network Termination
The following instructions apply only to the AquaTrend Interface without SOM,
Cat. No. 51200.
The network signals require a terminator for proper operation. As shipped
from the factory, the terminator is disabled on all AquaTrend Interfaces as
shown in Figure
IMPORTANT NOTE:Failure to properly terminate the network may cause total
network failure. Enable the network terminator at only one device.
Follow the steps below to enable the terminator and complete the installation
of the stand alone AquaTrend Interface.
1. Remove the front panel of the AquaTrend Interface and locate J6 on the
circuit board in the back housing of the device. J6 is a white, three-pin
connector. A jumper connected only to pin 2 should be present as shown
in Figure 24.
2. To enable the terminator, lift the jumper off of pin 2 and move the jumper
so it connects pins 2 and 3 as shown in
Back Enclosure
(Some components omitted for clarity.)
J6
24.
Front Enclosure
2 J3 1
6
TB1 1
U12
20 19
J7
U13
U11
1 J2 9
6
TB1 1
U12
Figure 25.
U5
DS1
SW1
U1
51350-18 Hardware Installation.fm