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Serial Interface Control

User Instructions

IDM corded

2.6.3 Protocol, ACK/ NAK Settings

PROGRAM F_DEFAULT

Family Code Selection P.C. Parameter Selection Option Code

Handshaking Protocol

SS None (free running mode)  0

SS RTS/CTS (hardware handshaking) 1

SS ACK/NAK (software handshaking) 2

SS Xon/Xoff (software handshaking) 3

SS 3 times  FIN

NAK Retry Count

SS 0-255 times

(3 digits)

ACK Indication

SS Disable ACK Time-out Indication 0

SS Enable ACK Time-out Indication  1

SS Disable ACK Indication  2

SS Enable ACK Indication 3

 USB COM doesn’t support RTS/CTS handshaking protocol.

 When the RTS/CTS Hardware Handshaking option is selected, the RTS (request to send) and CTS

(clear to send) signals will be issued before normal data communication. This option is very helpful to

ensure the reliability of data communication.

 When the ACK/NAK Software Handshaking option is selected, the Hand-held scanner waits for an

ACK (acknowledge) or NAK (not acknowledge) from the host computer after each data transmission. If

the NAK is received, the Hand-held scanner will re-send the data until receiving ACK.

NAK Retry Count

After transmitting data, the scanner expects a NAK response from the host up to the preset “Serial Response

Time-out”. If the scanner doesn’t get a response, the scanner will issue an error indication and discard the

data. When a NAK is received, the scanner transmits the same data again and waits for either an ACK or NAK.

The scanner issues an error indication and discards the data under following two conditions:

1. After preset NAK retry counts is received within the preset serial response time-out.

2. If the preset time-out is up but the preset NAK retry counts haven’t come to the end.

The default retry counts are three times. If you program “0 times”, the scanner will not resend the data to the

host when the scanner receives a NAK. The scanner will discard the data. If you program “255 times”, the

scanner can receive unlimited NAKs from the host within the pre-set serial response time-out.

This function is not available for batch mode. When you enable this function in on-line mode, the out-of-range

function will be disabled automatically.

SICK IDM series User Instructions

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