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Communication - Continued
High Resolution
Command ('H')
Undefined
Commands
ECR Serial
Communication
Protocol
This command will be optional. It is the same as the "W" command except that when
weight is returned, it is returned with ten times the scale's displayed resolution. Thus,
for decimal weight, the length of the weight field is equal to the length of the scale's
display plus three or four, and for pounds-ounce it will be the display length plus five
or six (depending on the presence of a decimal point.)
When the scale receives an unrecognised or unsupported command, it returns a
question mark.
The ECR serial communication protocol adheres to the pre-existing "standard" for ECR
scales. It also includes optional commands and the new scale status bit definitions
(described in the general protocol) as extensions which do no affect backwards compatibility.
This standard will be used by all other products other than ECR scales.
Symbol Key:
Command
W<CR>
<LF>xxx.xxuu<CR>
<LF>Shh<CR><ETX>
<LF>Shh<CR><ETX>
S<CR>
<LF>Shh<CR><ETX>
Z<CR>
<LF>Shh<CR><ETX>
all else
<LF>?<CR><ETX>
Scale bits will be the same as for the general protocol.
<ETX> End of Text character (03 hex)
<LF>
Line Feed character (0A hex)
<CR>
Carriage Return character (0D hex)
<SP>
Space (20 hex)
x
Weight numeric digit.
hh
Two status bytes
uu
Units of measure (LB, KG, OZ, G, etc.., all upper case)
Mandatory Commands
Scale Response
Returns decimal weight with units
or
Results
plus scale status.
Scale status only if wt <0, in
motion or out of capacity, or
zero error.
Returns to scale status
Scale is zeroed, returns status.
Unrecognized command
13
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