Watlow Series 734 Data Communications Manual de usuario descargar pdf (Pagina 12)

How to Use Data Communications

WATLOW Series 733/734

XON/XOFF "="

Figure 6 -

XON/XOFF "="

Command Example.

ASCII

Characters

HEX

Value

Space

41 4C31 20 35 30 30

<Space>

3D 20

<CR>

How To Start and Stop Communicating

with the Series 733/734 and XON/XOFF

Starting communications with XON/XOFF Protocol is simple. You just configure

your computer to agree with the Series 733/734 communication prompts and open

its serial communication port in software. Then begin to "talk" by transmitting a

message to the Series 733/734. You stop communicating with XON/XOFF Proto-

col simply by ceasing to send messages.

XON/XOFF "=" Command Example

The general command syntax is the one you've already seen. Each command

uses a slightly different variation of it, depending on the number of arguments

required for a message.

• You want to change the Alarm 1 Low (A1LO) value to 500°. The "=" command

will do the job.

The syntax with XON/XOFF Protocol requires an ending Carriage Return

<cr>.

"=" Command Syntax with XON/XOFF Protocol:

= <space> data.1 <space> data.2 <cr>

With the "=" Command, data.1 is the Series 733/734 prompt, in this case Alarm 1

Low, A1LO. Data.2 is the value you want to set for that prompt, in this example,

500.

Enter in ASCII:

= <space> A1LO <space> 500 <cr>

The hex string will be:

3D2041314C4F203530300D

Response from the Series 733/734:

It sends an "XOFF" when a carriage return is received and then an "XON" when

the unit is done processing the command.

• The complete list of Commands is in Table 5, Pages 17-19.

<XON>

<XOFF>

13 11

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 23 24

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