Black Box 945 - Manual (Page 16)

How to Use Data Communications
16
WATLOW Series 945
ANSI X3.28 "="
Figure 8 -
ANSI X3.28 "="
Command Example.
ANSI X3.28 "=" Command Example
The "=" Command sets a specific 945 parameter to a specific value. The general
command syntax applies to all commands. The definition and number of argu-
ments depends on the command itself. See Table 6, Pages 20 - 21.
In this example, you want to change the Alarm 1 Low value to 500
°
. Here, the "="
command will do the job.
'"=" command Syntax with ANSI X3.28 Protocol:
<STX> = <space> Data.1 <space> Data.2 <ETX>
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 ex-
ample, 500.
Enter in ASCII:
<STX> = <space> A1LO <space> 500 <optional carriage return> <ETX>
The hex string is:
023D2041314C4F2035303003
Stopping Communications in ANSI X3.28 Protocol
The master device, your computer, must end communications with Device #4 by
using Data Link Escape (DLE) and End of Transmission (EOT) characters.
Enter in ASCII: <DLE><EOT>
Response from the 945:
None
10 04
<DLE>
<EOT>
ASCII
Characters
HEX Value
ASCII
Character
HEX
Value
1
Space
5
0
0
41 4C 31 20 35 30 30
<Space>
=
3D 20
A
L
<STX>
<ETX>
02 03
Optional
Carriage
Return
4F
O