PEP Modular Computers Modular Computers RS485 - SMART Module Piggyback Connectors

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SMART I/O User’s Manual

Chapter 3 SMART-EXT

3.4.1 SMART Module Piggyback Connectors

There are two sets (one for each module) of SMART-Module piggyback

connectors present on the SMART-EXT, each divided into two sets of 2x8

standard pin rows. The communication to these connectors is achieved in

part via the 10-wire flat-band interface cable and directly by the MCU.

Pinouts digital side (ST1 and ST3)

Refer to figure 3.4.0.1 for the correct location of these pin-row connectors.

Slot A from 68HC05C4 MCU port A (ST1)

Pin Nr. Signal Description Pin Nr. Signal Description

1 PA1 Port A Pin 1 2 PA2 Port A Pin 2

3 PA3 Port A Pin 3 4 PA4 Port A Pin 4

5 PA5 Port A Pin 5 6 PA6 Port A Pin 6

7 PA7 Port A Pin 7 8 PA8 Port A Pin 8

9 System GND GND 10 Serial RxD RxD to SM-BASE

11 System VCC System +5V VCC 12 Serial TxD TxD from SM-BASE

13 CS-SLOTA Chip Select A 14 Serial CLK CLK from SM-BASE

15 Reset Power ON/OFF Reset 16 Slot A Interrupt line

INT4 to the

I/O Controller

Pin Nr. Signal Description Pin Nr. Signal Description

1 PB1 Port B Pin 1 2 PB2 Port B Pin 2

3 PB3 Port B Pin 3 4 PB4 Port B Pin 4

5 PB5 Port B Pin 5 6 PB6 Port B Pin 6

7 PB7 Port B Pin 7 8 PB8 Port B Pin 8

9 System GND GND 10 Serial RxD RxD from SM-BASE

11 System VCC System +5V VCC 12 Serial TxD TxD from SM-BASE

13 CS-SLOTB Chip Select B 14 Serial CLK CLK from SM-BASE

15 Reset Power ON/OFF Reset 16 Slot B Interrupt line Interrupt PI/T (H4)

Slot B from 68HC05C4 MCU port B (ST3)