Microscan MS-4X User Manual download pdf (Page 59)

MS-4X Imager User Manual

3-15

Communications

Daisy Chain Mode

Usage: Useful in applications where:

• More than one symbol type is present.

• A symbol may be present on multiple sides of a package.

• Symbols are presented at different depths.

Definition: In a daisy chain application, readers are connected in tandem or a “daisy

chain” and decoded data is relayed from one reader to another until the

data reaches the host.

A primary reader has its host port linked to the host computer and its auxiliary

port linked to the host port of the first secondary reader in the chain.

Thereafter, each secondary reader’s auxiliary port is linked to the host port

of the secondary reader that is farther from the host in the daisy chain.

Each reader in the chain can be assigned an ID that accompanies any data

that it sends.

Serial Cmd: <K101,aux port mode,baud rate,parity,stop bits,data bits,daisy chain i.d.

status,daisy chain i.d.>

Options: 4 = Daisy Chain

Function: Before the primary reader times out, it checks its auxiliary port for data. It

should be set to wait at least 30 ms for each secondary reader in the daisy

chain. If no data is received within the read cycle timeout, the primary

reader sends a No Read message to the host. Otherwise the complete data

is sent.

If, for example, the primary reader is set to timeout in 120 ms, the first

secondary reader reader downstream might be set to 90 ms, the next to 30

ms, and so forth, thus assuring that at least 30 ms elapses between transmissions.

Daisy-chained readers can send a series of symbols by enabling

Multisymbol

and a common multisymbol separator. If the primary reader does not

receive the expected number of symbols, No Read messages are

appended to the data string to make up the difference between the number

of symbols enabled in Multisymbol and the number of symbols read.

For example, a primary and two secondary readers have Number of

Symbols set to 3 and Multisymbol Separator defined as %. If the primary

and the first secondary reader do not find symbols, but the next secondary

reader registers a good read, the transmitted results would be:

symbol data % No Read % No Read

a. The above example assumes a best-case scenario. Other factors, such as baud rate, dynamic focus

timing, number of characters in a given symbol, and the number of secondary readers in the daisy chain

can affect timing and may need to be included in your calculations for complete accuracy.

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Microscan MS-4X User Manual Page 59

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