Watlow Series 942 Data Communications - Manual (Page 14)

14 WATLOW Series 942 How to Use Data Communications
XON/XOFF "?"
Figure 7 -
XON/XOFF "?"
Command Example.
ASCII
Characters
HEX
Value
1
41 4C 31
Space
?
3F 20
A
L
XON/XOFF "?" Command Example
You want to know the Alarm 1 Low (A1LO) value. The "?" uses a variation of
the message syntax shown just below. This protocol requires an ending
carriage return character.
"?" Command syntax with XON/XOFF Protocol:
? <space> Data.1 <CR>
Enter in ASCII:
? <space> A1LO <CR>
The hex string will be:
3F2041314C4F0D
The value of A1LO will be between rL (Range Low) and rH (Range High), say,
500.
Response from the Series 942:
<XOFF> <XON> <current value of A1LO> <CR>
The hex response string is:
13113530300D
CR
0D 4F
0
0
30
5
35 30
CR
0D
ASCII
Characters
HEX
Value
<XOFF>
13
<XON>
11
O