Solartron Mobrey 3595 4C, User Manual

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3595 4C User Manual Part One Preparing and Installing The 3595 4C Interface
35952350 (CH02/AA)
2-3
2.2 SELECTING ON-CARD S-NET TERMINATION
To avoid signal reflections, the S-Net cable must be correctly terminated at each end. The way in which
this is achieved depends on how the cable is connected between Host PC and the IMP devices. Two basic
arrangements are shown in Figure 2.1.
HOST PC IMP 1 IMP n
(S-Net terminated)
(S-Net In) (S-Net Out)
(S-Net In) (S-Net Out)
TERMINATOR
a)
IMP n
(S-Net In) (S-Net Out)
TERMINATOR
b)
IMP n
(S-Net Out) (S-Net In)
HOST PC
TERMINATOR
Figure 2.1: S-Net cable terminations
Where the Host PC is located at the end of S-Net (Figure 2.1a), the S-Net cable is terminated on-board the
4C Interface card. Here, connection between cable and terminator is made through ‘on-card’
Jumper J202
(See Figure 2.2). The other terminator is fitted to IMP S-Net terminals at the opposite end of the cable.
Where the Host PC is located between IMP devices (See Figure 2.1), the ‘on-card’ termination must be
disconnected. To do this, carefully remove the link on
Jumper J202 . An S-Net cable terminator is then
fitted to the IMP devices at both ends of the S-Net cable.
Figure 2.2: Location of S-Net termination Jumper J202
Two S-Net cable terminators for IMP devices are supplied with the 3595 4C Interface card. Instructions for
fitting S-Net cables and cable terminators to an IMP are given in the “3595 Series IMP Installation Guide”.