Motorola LS2208-SR20007R User Manual - Page 94
Software Handshaking, None, ACK/NAK, ENQ
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6 - 16 Symbol LS2208 Product Reference Guide Software Handshaking This parameter offers control of the data transmission process in addition to, or instead of, the control that hardware handshaking offers. There are five options. If software handshaking and hardware handshaking are both enabled, hardware handshaking takes precedence. None Select this option to transmit data immediately. No response is expected from host. *None ACK/NAK If you select this option, after transmitting data, the scanner expects either an ACK or NAK response from the host. When a NAK is received, the scanner transmits the same data again and waits for either an ACK or NAK. After three unsuccessful attempts to send data after receiving NAKs, the scanner issues an error indication and discards the data. The scanner waits up to the programmable Host Serial Response Time-out to receive an ACK or NAK. If the scanner does not get a response in this time, it issues an error indication and discards the data. There are no retries when a time-out occurs. ACK/NAK ENQ If you select this option, the scanner waits for an ENQ character from the host before transmitting data. If the scanner does not receive an ENQ within the Host Serial Response Time-out, it issues an error indication and discards the data. The host must transmit an ENQ character at least every Host Serial Response Time-out to prevent transmission errors. ENQ