Sensoray 826 Bedienungsanleitung PDF herunterladen (Seite 8)

2.1.1 Timestamp Generator

A timestamp generator is shared by the analog input system and counter channels. The timestamp generator is a free-

running 32-bit counter that increments every microsecond. The generator starts at zero counts upon board reset and

overflows every 2

microseconds (approximately 71.6 minutes). The timestamp counter is not writable, but the current

timestamp counts can be read by calling the S826_TimestampRead function.

2.1.2 Board Reset

Upon power-up, or in response to a hardware reset, all interfaces and outputs are forced to default initial states. The initial

conditions of the interfaces are discussed in the interface chapters.

2.2 Hardware Configuration

Up to sixteen model 826 boards can coexist in a single host computer. When more than one board is used in a system, each

board must be configured before installation; this is done by setting quad dip switch SW1 to assign a unique identifier

(board number) in the range 0 to 15 to the board.

By default, all model 826 boards are factory configured as board number 0. No reconfiguration is necessary if there is only

one 826 board in the host computer; simply leave it configured at its default board number.

If more than one 826 board will be plugged into a common backplane, the boards must be configured so that each board has

a unique board number. Board numbers are typically contiguous, though this is not required. For example, board numbers 0

and 3 could be assigned in a two-board system, though it would be more common to assign board numbers 0 and 1. This

table shows the relationship between board number and switch settings:

Board Number SW1-4 SW1-3 SW1-2 SW1-1 Notes

0 OFF OFF OFF OFF Factory default

1 OFF OFF OFF ON

2 OFF OFF ON OFF

3 OFF OFF ON ON

4 OFF ON OFF OFF

5 OFF ON OFF ON

6 OFF ON ON OFF

7 OFF ON ON ON

8 ON OFF OFF OFF

9 ON OFF OFF ON

10 ON OFF ON OFF

11 ON OFF ON ON

12 ON ON OFF OFF

13 ON ON OFF ON

14 ON ON ON OFF

15 ON ON ON ON

826 Instruction Manual 3 Introduction

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Sensoray 826 Bedienungsanleitung Seite 8