Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 56)

100

101

SMART I/O User’s Manual

March 12, 1996

Page 2 - 16

Chapter 2 SMART-BASE

The full-duplex description may be found in the SMART-I/O Advanced

User’s Guide.

There is no internal line termination as laid down in DIN 19245 Part 1

and must be performed externally.

Note

ST7

Pin 1 Pin 2

Pin 9 Pin 10

SMART-BASE

2.5.7 SPI Connector (ST7)

The SPI connector is a 2x5 standard pinrow connector, located on the right-

hand side of the SMART-BASE to enable easy connection of the SMART-

EXT module using a flat ribbon cable connection.

The line termination is achieved as shown in

the figure. Assuming a power supply voltage

of +5V emanating from the PROFIBUS

connector (pin 6), the following resistor

values are recommended.

150Ω ± 2%, min 0.25W

390Ω ± 2%, min 0.25W

Pin Nr. Signal Pin Nr. Signal

1 System VCC 2 Serial RxD

3 System VCC 4 Serial TxD

5 Serial Ext. Select 6 Serial CLK

7 System GND 8 Reset

9 System GND 10

Serial Ext. Interrupt

(Controller I/O IRQ4)

= 390Ω

= 150Ω

= 390Ω

Aux. +5V, 90mA

T/RxD +

T/RxD -

Aux. GND

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 319 320

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