Watlow Series 734 Data Communications - Manual (Page 10)

How to Use Data Communications
10
WATLOW Series 733/734
Learn Syntax
Series 733/734 General Message Syntax
As soon as you link the devices, you'll be able to talk to the Series 733/734 using
ASCII characters.
The Series 733/734 will respond to any Operation or Program prompt, plus some
others. The control will respond to either upper or lower case ASCII characters
from your computer.
Both protocol/interface combinations will respond to the general syntax, providing
the commands or queries are correctly transmitted. However, the ANSI X3.28
Protocol requires beginning and ending characters, and the XON/XOFF Protocol
requires ending characters. We'll look at those shortly.
Message Syntax
Messages from your computer to the Series 733/734 must take this general form.
All commands do not require the full number of data fields.
Command data.1 data.2 data.3... data.N
"Command" is a character set to which the Series 733/734 will respond. The
brackets "< >" enclose a non-literal description. "Space" is simply a delimiter, an
ASCII space character (Hex 20). "Data Fields" are prompts and values specific to
a command; the number of possible data fields depends on the particular com-
mand you use. Data 1 is here abbreviated, "data.1", Data 2 is "data.2" and so on.
In the syntax explanations ahead, we'll show you the specific arguments for each
command. It will speed the process, if you remember this general syntax.
Data Rules
Data fields are prompts and values specific to particular commands. These rules
govern their use. Specific data for each command is listed later in this chapter.
• Data will be ASCII 0 through 9, unless otherwise noted.
• Data can go up to seven total characters, including a minus sign. A + or - sign, if
used, must be first, and it must have a decimal point if applicable.
• Data can use leading zeros. (Up to 7 digits.)
• Data does use decimal points.
• Data.1 portion of message can be up to four total characters.
Command List
These commands, represented by their respective ASCII characters, will enable
you to program the Series 733/734 from your computer. More detailed descrip-
tions of the commands are in Table 5, pages 17-19.
? Finds the value of a specific prompt. p. 17 - 19
= Sets a specific prompt to a specific value. p. 17 - 19