Communication Summary; Rts/Cts Lines; Ack/Nak Option; Number Of Data Bits - Motorola Symbol MS4404 Integration Manual

ACK/NAK Disabled and Unpacketed ASCII Data
The decoder captures data and sends it to the host.
Decoder
Decoder
captures data

Communication Summary

RTS/CTS Lines

All communication must use RTS/CTS handshaking as described in the Simple Serial Interface Programmer's
Guide, p/n 72-40451-xx. If you disable or bypass hardware handshaking, send the WAKEUP command prior to all
other communications, or the first byte of a communication message may be lost during the decoder wakeup
sequence.

ACK/NAK Option

You can enable or disable ACK/NAK handshaking. This handshaking is enabled by default and Motorola
recommends leaving it enabled. Disabling this handshaking can lead to communication problems, as handshaking
is the only acknowledgment that a message was received, and if it was received correctly. ACK/NAK is not used
with unpacketed decode data regardless of whether or not this option is enabled.

Number of Data Bits

All communication with the decoder must use 8-bit data.

Serial Response Time-out

Use the Serial Response Time-out parameter to set how long to wait for a handshaking response before trying
again, or aborting any further attempts. Set the same value for both the host and decoder for this parameter.
NOTE You can make a temporary change to the Serial Response Time-out when the host takes longer to process
an ACK, or longer data string. Frequent permanent changes are not recommended due to limited write
cycles of non-volatile memory.
(1)
Host
ASCII data sent
SSI Interface 8 - 5