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WATLOW Series 945
How to Use Data Communications
XON/XOFF "="
Figure 6 -
XON/XOFF "="
Command Example.
ASCII
Characters
HEX
Value
1
Space
5
0
0
41 4C31 20 35 30 30
<Space>
=
3D 20
A
L
<CR>
0D
4F
O
<XON>
13 11
<XOFF>
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 945 parameter, in this case Alarm 1 Low,
A1LO. Data.2 is the value you want to set for that parameter, in this example, 500.
Enter in ASCII:
= <space> A1LO <space> 500 <CR>
The hex string will be:
3D2041314C4F203530300D
Response from the Series 945:
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 "=" Command data (parameters and value limits) is in
Table 6, Pages 20 - 21.
How To Start and Stop Communicating
with the Series 945 and XON/XOFF
Starting communications with XON/XOFF Protocol is simple. You just configure
your computer to agree with the Series 945 communication parameters and open its
serial communication port in software. Then begin to "talk" by transmitting a mes-
sage to the Series 945. You stop communicating with XON/XOFF Protocol simply by
ceasing to send messages.