Watlow Series 942 Data Communications - Manual (Page 13)

How to Use Data Communications
13
WATLOW Series 942
XON/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 "=" Com-
mand 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 942 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 942:
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 5, Pages 19 - 21.
ASCII
Characters
HEX
Value
1
Space
5
0
0
41 4C 31 20 35 30 30
<Space>
=
3D 20
A
L
<CR>
0D 4F
O
Figure 6 -
XON/XOFF "="
Command Example.
<XON>
13 11
<XOFF>