Newland EM1300 Manual descarregar pdf (Página 26)

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Page 17

Electrical Interface

Output Signals

Here are the descriptions of the output signals, such as Beeper, LED and inter-character timeout. They can be

used to detect the status of the scanning, message uploading and the state of the Engine.

LED Output

When the Engine completes the initialization, the LED line is high. The LED line goes low for 150 ms after a

successful reading and, if programmed, transmission of the code message.

Beeper Output

Table below is the deﬁnitions of the beeper outputs:

Beep Pattern Deﬁnition

Low-higher-higher-higher Power ON completed

1 beep Successful reading of an ordinary barcode

2 beeps Successful reading of a programming barcode

The message upload format is in binary. It is the binary value of the decoded barcode value including preﬁx,

sufﬁx, and so on.

Inter-Character Timeout is used to determine the end of barcode message.

Host could use inter-character timeout to determine the end of data upload. An inter-character timeout means

the longest delay time between 2 consecutive (binary) characters in a sequence of (binary) characters sent

over serial line. It is usually enabled only after the ﬁrst character is received to avoid unwanted timeout

events during the waiting of a message.

The inter-character timeout value should be set to about 5 times of a character’s transmission time. When

the inter-character timeout occurs, it is the end of data upload. For example, 5 ms can be used as an inter-

character timeout for the baud rate of 9600, 8 data bit, no parity bit, and one stop bit.

Inter-Character Timeout

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