Micromod Micro-DCI: 53SL6000 Single Loop Controller Manual do Utilizador descarregar pdf (Página 124)

C.1 Overview

Thirty-two addressable controllers (0-31) can be

connected to a datalink for information transfer

to/from a host, which initiates all transactions.

This section provides information to configure the

system module (prompts iA, bAUd, dLP, dLS, and

dLE), a description of the datalink protocol mes-

sage field definitions, a summary table of the con-

troller memory address scheme, and a

mnemonic-datapoint cross reference table

unit-tag•atom transfers.

C.2 Configuring the System

Module for Datalink

To initiate the controller for datalink communica-

tions, respond to the system module prompts with

new values/selections if the default (Dft) settings

shown in Table C-1 requires changing.

Table C-1. System (SYS) Prompts (Datalink)

(conF Menu

→

SYS Module)

Prompt Description Dft

Instrument Addrsss

It is the address assigned to this

controller on the datalink. Valid

addresses are from 0 - 31. No two

controllers can have the same

address on the datalink.

bAUd

Baud Rate

This value is set to match the data

transfer rate of the datalink. Valid

menu selections are:

110 4800

300 9600

600 19.2K

1200 14.4K

2400 28.8K

9600

dLE

Datalink Enable

Selections are as follows:

on:

Allows controller datalink

communication.

oFF:

The controller is not permitted

to communicate over the

datalink.

dLP

Datalink Parity

Selections are as follows:

on:

It indicates parity generation

and checking for even parity

serial byte protocol is enabled.

oFF:

It indicates no parity protocol.

Table C-1. System (SYS) Prompts (Datalink)

(conF Menu

→

SYS Module)

Prompt Description Dft

dLS

Datalink Stuffing

Selections are as follows:

on:

Selects F&P byte stuffing which

inserts a NULL (00) byte after

every SOH (7E hex) that is not

the beginning of a message.

This permits user written

communications software to

determine the number of bytes

to expect in a response

message.

oFF:

Disables datalink stuffing.

tAG

Tag Name

Allows a 10 character datalink tag

to be assigned to the controller.

Four characters maximum can be

displayed at any one time. Using

the engineer mode shift right push

button, the ten character positions

are displayed as follows:

0123

→

3456

→

6789

Characters are selected for each

position with the scroll

forward/backward push buttons.

C.3 Protocol

The datalink protocol requires the host to initiate all

transactions. There are two basic categories for all

of the datalink message types: interrogate, which

is used to read data from an addressed controller,

and change, which is used to alter a value in an

addressed controller. The addressed controller de-

codes the message and provides an appropriate

response. The protocol message field definitions

are provided in Table C- 2.

Table C-2. Datalink Protocol

Symbol Description

SOH

Start of Header

This character, 7E, denotes the beginning

of a message.

I.A.

Instrument Address

The address of the controller responding

to the transaction. It must be within a

range of 00-1F (00-31 decimal).

Appendix C: Datalink Protocol

Appendix C. Datalink Protocol 53SL6000 Instruction Manual

C-1

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