Lakeshore Learning Materials 622 Manual de usuario descargar pdf (Pagina 85)

Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual

Mainframe Control Bus Operation

B-1

APPENDIX B

MAINFRAME CONTROL BUS OPERATION

B1.0 GENERAL

There are seven elements to the Model 622/623 Mainframe Control Bus operating instructions: Control Bus

Serial Interface Specifications (Paragraph B2.0), Control Bus Serial Interface Connector (Paragraph B3.0),

Control Bus Serial Interface Configuration (Paragraph B4.0), Selecting the Control Bus Serial Interface

Address (Paragraph B5.0), Control Bus Serial Interface Operation (Paragraph B6.0), and a sample control bus

serial interface program (Paragraph B7.0).

B2.0 CONTROL BUS SERIAL

INTERFACE SPECIFICATIONS

The MPS Mainframe control bus serial

interface may be configured either for

RS-232C or RS-485. RS-232C is an

unbalanced (single ended), non

terminated line for short distances

(typically less than 50 feet) where the

host computer serial interface is

dedicated to one MPS Mainframe.

RS-485 is a balanced, terminated line

for multidrop (party-line)

configurations with up to 32 drivers

and receivers sharing the same line

for data transmission. Each interface

instrument has a unique address and

operates in a polled mode. Set the

MPS Mainframe to respond to one of

32 addresses.

B3.0 CONTROL BUS SERIAL INTERFACE CONNECTOR

The serial interface connectors use dual standard

6-wire RJ-11 modular (phone) jacks. The two

connectors are in parallel and facilitate the RS-485

multidrop configuration. Lake Shore Model 2001 data

cables, which maintain pin 1 polarity, simplify multiple

Mainframe interconnection. Lake Shore offers the

Model 2002 RJ-11 to DB-25 adapter and Model 2003

RJ-11 to DE-9 adapter to connect to the host

computer.

Serial Interface

Specification

Configured

For RS-232C

Configured

For RS-485

Transmission Three Wire Two Wire

Address Configuration None Polled 1-32

Distance 50 Feet 4000 Feet

Connector Dual RJ-11 Modular (phone) Jacks

Timing Format Asynchronous

Transmission Rate Half Duplex

Baud Rate 9600

Bits per Character 1 Start, 7 Data, 1 Parity, 1 Stop

Parity Type Odd

Data Interface Levels Tx/Rx Using EIA Levels

Terminator LF (0AH)

Pin RS-232C Function RS-485 Function

1 No Connection No Connection

2 Receive Data A

3 Signal Ground No Connection

4 Signal Ground No Connection

5 Transmit Data B

6 No Connection No Connection

1 2 ... 80 81 82 83 84 85 86 87 88 89 90

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Lakeshore Learning Materials 622 Manual de usuario Pagina 85

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