Black Box 945 Manual De Usuario
17
WATLOW Series 945
How to Use Data Communications
ANSI X3.28 "?"
Figure 9 -
ANSI X3.28 "?"
Command Example.
ANSI X3.28 "?"
Command Example.
ANSI X3.28 "?" Command Example
You need to know the Alarm 1 Low value (A1LO). The "?" uses a variation of the
message syntax shown just below. This syntax requires the protocol start of
text and end of text characters.
message syntax shown just below. This syntax requires the protocol start of
text and end of text characters.
"?" command syntax with ANSI X3.28 Protocol:
<STX> ?<space> <Data.1> <ETX>
<STX> ?<space> <Data.1> <ETX>
Enter in ASCII:
<STX> ? <space> <A1LO> <optional carriage return> <ETX>
The hex string will be:
023F2041314C4F03
<STX> ? <space> <A1LO> <optional carriage return> <ETX>
The hex string will be:
023F2041314C4F03
First response from the Series 945:
<ACK>
The <ACK> hex response string is:
06
<ACK>
The <ACK> hex response string is:
06
Your computer's confirming response:
<EOT>
The <EOT> response hex string is:
04
<EOT>
The <EOT> response hex string is:
04
Second response from the Series 945:
<STX> <current A1LO value> <carriage return> <ETX>
The hex string is:
023530302003
<STX> <current A1LO value> <carriage return> <ETX>
The hex string is:
023530302003
Your computer's next response:
<ACK> or < NAK> (if the message needs to be repeated).
The hex string is:
06 or 15
<ACK> or < NAK> (if the message needs to be repeated).
The hex string is:
06 or 15
Final response from the Series 945:
<EOT>
The hex string is:
04
<EOT>
The hex string is:
04
Response from the Series 945:
<ACK>
The hex response string is:
06
<ACK>
The hex response string is:
06
• You'll find the the complete list of "=" command arguments (parameters and
value limits) in Table 6, Pages 20 - 21.
value limits) in Table 6, Pages 20 - 21.
5
0
<STX>
ASCII
Characters
Characters
HEX
Value
Value
20
0
0
<
<CR>
<ETX>
ASCII
Characters
Characters
HEX
Value
Value
1
41
4C
31
Space
?
3F 20
A
L
<STX>
02
03
Optional
Carriage
Return
O
4F