Table 5 lists the electrical, mechanical, and environmental specifications for the Smart
Star backplanes.
Table 5. Smart Star Backplane Specifications
Specification
Parameter
SR9010
SR9050
Board Size
6.50" × 4.20" × 0.75"
(165 mm × 107 mm × 19 mm)
3.75" × 4.40" × 0.75"
(95 mm × 112 mm × 19 mm)
Connectors
Slot Select
Temperature
Humidity
External Input Voltage
Onboard Voltage Regulator
Data Lines
Address Lines
Read/Write Control
Reset
User ’s Manual
one 2 × 26 (CPU card slot), 2 mm one 2 × 26 (CPU card slot), 2 mm
seven 2 × 13 (I/O card slots), 2 mm three 2 × 13 (I/O card slots), 2 mm
Each slot has a predefined dedicated set of addresses
(see Appendix D and the software chapters in the
individual I/O card manuals)
–40°C to +70°C
5% to 95%, noncondensing
9 V to 30 V DC at 1 A typical for onboard +5 V regulated supply;
provision for independent 9 V to 30 V DC ( V_USER ) voltage source for
I/O cards—the exact voltage for the second supply depends on the
requirements of the specific I/O cards used (Rabbit recommends tying
V_USER to +RAW unless there is a specific need for an independent
power supply)
Surface-mount switching regulator sources 5 V at 1 A
Buffered bidrirectional data lines (D0–D7)
Buffered address lines (A0–A3)
Buffered IORD, IOWR
I/O cards and CPU card can be reset independently
61
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