Cino SM5700 - Manual (Page 58)

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53
PROGRAM
Serial Interface Control
♦ ♦ ♦ ♦ Protocol, ACK/NAK Setting ♦
♦ ♦ ♦
F_DEFAULT
Family Code Selection P.C Parameter Selection Option Code
Handshaking Protocol SS
SS
SS
SS None (free running mode)
RTS/CTS (hardware handshaking)
ACK/NAK (software handshaking)
Xon/Xoff (software handshaking) 0
1
2
3
NAK Retry Count SS
SS 3 times
0~255 times FIN
(3 digits)
ACK Indication SS
SS
SS
SS Disable ACK Time-out Indication
Enable ACK Time-out Indication
Disable ACK Indication
Enable ACK Indication
0
1
2
3
USB COM doesn’t support RTS/CTS handshaking protocol.
When the ACK/NAK Software Handshaking option is selected, the FuzzyScan waits for an ACK (acknowledge) or NAK (not acknowledge) from the host computer after
each data transmission. If the NAK is received, FuzzyScan will re-send the data until receiving ACK.
NAK Retry Count
After transmitting data, the scan module expects a NAK response from the host up to the preset “Serial Response Time-out”. If the scan module doesn’t get a response,
the scan module will issue an error indication and discard the data. When a NAK is received, the scan module transmits the same data again and waits for either an ACK or
NAK. The scan module 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 time”, the scan module won’t resend the data to the host when the scan module receives a NAK. The scan
module will discard the data. If you program “255 times”, the scan module 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 disable automatically.
ACK Indication:
Disable: There’s neither LED nor beeping indication for this setting.
Enable: There’s a specific LED and beeping indication for this setting.