Watlow CLS200, MLS300 and CAS200 Manual de usuario descargar pdf (Pagina 12)

6 Communications Speciﬁcation

Chapter 1: ANAFAZE/AB Protocol

Packet Format

Messages are transmitted in the form of packets. Command and reply

packets specify the source and destination addresses, whether to read or

write, the block of data to read or write, etc.

A packet contains a sequence of binary bytes formatted this way:

Sending Control Codes

To send a control code, send a DLE before the control code to

distinguish it from data.

Sending a DLE as Data

When you send a byte with an x10, (a DLE), the controller and software

interpret it as a command. Therefore, to send a DLE as data, send

another DLE immediately before it (DLE DLE).

Codes in a Packet

This section describes the sequence of bytes in a packet, in the order the

host software or controller sends them.

DLE STX

•

The DLE STX byte signals the beginning of a transmission. Every

packet of information starts with the control codes DLE STX.

DST

•

The DST byte is the address of the destination device (usually a con-

troller; the ﬁrst Watlow Anafaze controller is at x08).

NOTE

When host software communicates with an MLS, a CLS, or

a CAS in ANAFAZE or AB protocol, it does not send the

controller’s actual address. Since the protocol reserves

device addresses 0 to 7, the host software sends the value

(controller address + 7), instead of the actual device

address.

SRC

•

The SRC byte is the device address of the packet’s source. The host

software is usually designated address x00.

DLE STX DLE ETX BCC/CRC

DST

SRC CMD

STS

TNSL TNSH ADDL

ADDH

DATA

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 91 92

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Watlow CLS200, MLS300 and CAS200 Manual de usuario Pagina 12

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