Справочник Пользователя для Motorola MS4407
SSI Interface
8 - 5
ACK/NAK Disabled and Unpacketed ASCII Data
Data captured by the decoder is sent to the host.
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 hardware handshaking is disabled or bypassed, the WAKEUP command must be sent
prior to all other communications, or else the first byte of a communication message may be lost during the
decoder wakeup sequence.
Guide, p/n 72-40451-xx. If hardware handshaking is disabled or bypassed, the WAKEUP command must be sent
prior to all other communications, or else the first byte of a communication message may be lost during the
decoder wakeup sequence.
ACK/NAK Option
ACK/NAK handshaking can be enabled or disabled. This handshaking is enabled by default and we suggest the
option not be disabled. Disabling this handshaking may 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.
option not be disabled. Disabling this handshaking may 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
The Serial Response Time-out parameter is used to determine how long to wait for a handshaking response before
trying again, or aborting any further attempts. Both the host and decoder should use the same value for this
parameter.
trying again, or aborting any further attempts. Both the host and decoder should use the same value for this
parameter.
Decoder
Data is captured
by decoder
Host
(1)
ASCII data sent
NOTE
A temporary change may be made 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.
an ACK, or longer data string. Frequent permanent changes are not recommended due to limited write
cycles of non-volatile memory.