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The Verify Function
When many scales or other peripherals are connected to a computer, it is sometimes
useful for the computer to be able to check on the status of these devices. The verify
function can be used to determine the model number of a scale and determine that
the scale is functioning properly. To enable the verify function, transmit an ASCII "V".
If the scale is functioning properly, a scale will send one of the following messages
followed by carriage return and line feed:
"Setra 35 CP"
"Setra 70 CP"
"Setra 140 CP"
Status After Power is Applied
All Setra scales have an internal nonvolatile memory for storing certain status informa-
tion. This memory is not erased when the scale is powered down. All setup functions
(such as print format, minimum pieces, minimum accuracy, baud rate, and tone enable/
disable) and user conversion factors are stored in this memory. As a result, the baud rate
and print format will not need to be reset each time the scale is powered on. However,
if the continuous print mode is desired, follow the procedure previously outlined.
During the first 30 seconds of operation, the scale will run through a self diagnostic
procedure. When it is ready, a wake-up message will be transmitted. (This message can
also be invoked by sending a "w" to the scale or by pressing 0 then setup/cal .)
The RS-232 Interface Hardware
Although Setra scales can communicate with almost any RS-232 device, the built-in
interface does not include the complete protocol. Four lines of the standard interface
are used. This should not present any interfacing problems in most applications.
The data format is:
8 data bits
1 start bit
1 stop bit
no parity
framing errors ignored
Use a standard RS-232 cable to connect the external device to the scale, or
construct one following the instructions below.
The female connector pinout, as viewed from the back of the scale, is shown below:
13 7 3 2 1
* * * * * * * * * * * * *
* * * * * * * * * * * *
25 14
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