Motorola DS6707-DP20411ZZR Reference Guide - Page 143
Software Handshaking
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Hardware Handshaking (continued) RS-232 Interface 8 - 13 RTS/CTS Option 2 RTS/CTS Option 3 Software Handshaking This parameter offers control of the data transmission process in addition to, or instead of, that offered by hardware handshaking. 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. • ACK/NAK: If you select this option, after transmitting data, the digital imager scanner expects either an ACK or NAK response from the host. When it receives a NAK, the digital imager 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 digital imager scanner issues an error indication and discards the data. The digital imager scanner waits up to the programmable Host Serial Response Time-out to receive an ACK or NAK. If the digital imager 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. • ENQ: If you select this option, the digital imager scanner waits for an ENQ character from the host before transmitting data. If it does not receive an ENQ within the Host Serial Response Time-out, the digital imager scanner 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. • ACK/NAK with ENQ: This combines the two previous options. For re-transmissions of data, due to a NAK from the host, an additional ENQ is not required.