Campbell CR850 Specifikace stáhnout pdf (Strana 8)

CR800 and CR850 Overview

OV1.1.9 Pulse Inputs (P1-2)

Two Pulse input channels can count pulses from high-level (5 V square wave),

switch closure, or low-level A/C signals.

OV1.1.10 Program Status

The LED will blink once every 3 seconds if there is power, but no program

executing. If there is an executing program, the LED flashes once every 15

seconds.

OV1.2 Communication and Data Storage

OV1.2.1 CS I/O

All Campbell Scientific communication peripherals connect to the CR800

through the 9-pin subminiature D-type socket connector located on the front of

the Wiring Panel labeled “CS I/O” (Figure OV1-3). Table OV1-1 gives a brief

description of each pin.

TABLE OV1-1. Pin Description

ABR = Abbreviation for the function name.

PIN = Pin number.

O = Signal Out of the CR800 to a peripheral.

I = Signal Into the CR800 from a peripheral.

PIN ABR I/O Description

1 5 V O 5V: Sources 5 VDC, used to power peripherals.

2 SG Signal Ground: Provides a power return for pin 1

(5V), and is used as a reference for voltage levels.

3 RING I Ring: Raised by a peripheral to put the CR800 in the

telecommunications mode.

4 RXD I Receive Data: Serial data transmitted by a peripheral

are received on pin 4.

5 ME O Modem Enable: Raised when the CR800 determines

that a modem raised the ring line.

6 SDE O Synchronous Device Enable: Used to address

Synchronous Devices (SDs), and can be used as an

enable line for printers.

7 CLK/HS I/O Clock/Handshake: Used with the SDE and TXD

lines to address and transfer data to SDs. When not

used as a clock, pin 7 can be used as a handshake

line (during printer output, high enables, low

disables).

8 +12 VDC

9 TXD O Transmit Data: Serial data are transmitted from the

CR800 to peripherals on pin 9; logic low marking

(0V) logic high spacing (5V) standard asynchronous

ASCII, 8 data bits, no parity, 1 start bit, 1 stop bit,

300, 1200, 2400, 4800, 9600, 19,200, 38,400,

115,200 baud (user selectable).

OV-4

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 49 50

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Campbell CR850 Specifikace Strana 8

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