Datalogic Star Bedienungsanleitung PDF herunterladen (Seite 53)

REFERENCES

Correct FRAME identification is managed by frame packing. Three different types of

frame packing can be selected:

• Frame+ [CR]

(default)

: the frame sent to STARModem™ is terminated by

[CR]. This means you cannot use the [CR] character within the frame.

In Frame + [CR] mode, make sure the FRAME does not contain [CR], nor begin

with $+ or #+ characters.

FRAME [CR]

The frame transmitted by STARModem™ has no additional field. In this case

the end of the FRAME is either DATA or Terminator if any.

FRAME

• [STX]+LEN+Frame+[CR]: both frames sent to and by STARModem™ are

preceded by [STX], LEN and terminated by [CR], where LEN is a field of 4 digits

and indicates the FRAME length in number of characters, that is FRAME +CR.

[STX] LEN FRAME [CR]

The [STX], [CR] and [ESC] characters contained in the frame must be preceded

by the [ESC] character for a correct transmission.

• Frame after Timeout: if the delay between two consecutive characters is more

than the selected timeout, the modem considers the frame completed. The

timeout corresponds to 1/10 of the value defined for RX Timeout (see par. 2.2.3).

herefore, the timeout for frame packi

ng is calculated in ms (from 10 ms to 990

ms).

NOTE

It is not possible to disable this timeout, therefore possible

values are in the range 10 - 990 ms. If RX Timeout is disabled,

Frame after Timeout is 10 ms.

Both the frames sent to and by STARModem™ have no additional fields:

FRAME

All commands to be sent using this frame packing must be preceded by the

string below, which substitutes the $+ character:

#+++PROG_REQ+++#

This string is always transmitted in a single frame preceding the one containing

the configuration command, as shown in the following examples:

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 71 72

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Datalogic Star Bedienungsanleitung Seite 53