SA-ACU-SR User
Manual
S-Access GmbH
Tel: +41 44 700 31 11
Oberhausenstrasse 47
Page
8
of
16
Fax: +41 44 700 31 03
8907 Wettswil a/A
Email:
Switzerland WEB:
www.s-access.ch
The front panel of the module contains:
•
four LEDs, indicating the operating conditions of the power feeding circuits and the
presence of the external clock signal;
•
the “2048 kHz IN” socket for the connection of the external clock source;
•
the “RS485” socket for the centralized control of external devices via the RS485
interface;
•
the “MONITOR” socket for the connection of the shelf to a computer while controlling and
configuring devices;
•
the “Alarm relays” socket for the connection of external alarm signaling units.
3.2 Description and lay-out of jumpers and sockets
Fig. 3.2 shows the layout of jumpers and sockets.
J1, J2
J3, J4, J5
J6, J7
J14
Fig. 3.2 Layout of jumpers and sockets
Jumpers J1, J2, J14 are set for debugging purposes. The normal condition is “closed”.
Jumpers J2, J4, J5 are used to set the address of the shelf at the centralized control
management via the SA-CMU module. The user’s guide for the SA-CMU module describes
in detail the methods for the determination of the shelf address. The normal condition is
“open”.
When necessary, jumpers J6 and 7 are used to set the matching impedance of 120 Ohm for
the correct connection of devices over the RS485 interface.
