CSE Kingfisher PLUS+, Hardware Reference Manual

Page: 28 / 89

Superseded Hardware Manual 7.12 Page 28
1.6 S BX-2: Min i P ro c e s s o r Un it
The SBX-2 mini processor unit provides all processing, I/O scan, logic, control and communications
required in a small RTU. This unit has two independent serial ports; one of which, port 2 (P2) may be
software configured for RS232C or RS485 circuit interfaces. Port 1 is fixed at RS232C. This unit is
manufactured as an option board for the combination IO-3 module and must be fitted to this module
prior to installing on a BA-3 backplane. The SBX-2 is used with a 3-slot 24 VDC backplane (BA-3).
The two serial ports are accessed using cables that connect to the backplane.
In addition this unit is available in two memory configurations. The standard configuration is 128 kB of
flash memory for the storage of all operating code and selected system parameters, and 128 kB of
battery backed static RAM for all configuration and event storage data. This memory configuration is
ordered as SBX-2/IO-3-0. An optional extended memory configuration adds 128 kB of static RAM and
is ordered as SBX-2/IO-3-1. The extended memory configuration is only required in special
circumstances and intended users should consult the factory.
The RAM battery is enabled by a link at the rear of the module - see figure below.
Link for RAM
battery
Factory default:
RAM link installed
Figure: SBX-2 Rear Module IO-3 and RAM Battery Link Location
LEDs showing status of the serial ports are present on the IO-3 module and reference to this module
should be made. This module consumes power from the +5 VDC bus on the backplane. The module
can be installed only in slot 2 of a BA-3 backplane in a system.