SSI Interface
6 - 3
SSI Transactions
General Data Transactions
ACK/NAK Handshaking
If you enable ACK/NAK handshaking, all packeted messages must have a CMD_ACK or CMD_NAK response,
unless the command description states otherwise. This parameter is enabled by default. Motorola recommends
leaving this handshaking enabled to provide feedback to the host. Raw decode data and WAKEUP do not use
ACK/NAK handshaking since they are not packeted data.
Following is an example of a problem which can occur if you disable ACK/NAK handshaking:
•
The host sends a PARAM_SEND message to the decoder to change the baud rate from 9600 to 19200.
•
The decoder cannot interpret the message.
•
The decoder does not implement the change the host requested.
•
The host assumes that the parameter change occurred and acts accordingly.
•
Communication is lost because the change did not occur on both sides.
If you enable ACK/NAK handshaking, the following occurs:
•
The host sends a PARAM_SEND message.
•
The decoder cannot interpret the message.
•
The decoder CMD_NAKs the message.
•
The host resends the message.
•
The decoder receives the message successfully, responds with CMD_ACK, and implements parameter
changes.
Summary of Contents for Symbol PL4507
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Page 3: ...Symbol PL4507 Decoder Integration Guide 72E 116649 02 Revision A April 2009 ...
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Page 40: ...2 12 Symbol PL4507 Decoder Integration Guide ...
Page 43: ...Accessories 3 3 Figure 3 2 Symbol SE4500 to PL4507 21 Pin Flex p n 15 113896 01 ...
Page 45: ...Accessories 3 5 Figure 3 4 Symbol PL4507 30 Pin Mating Host Connector p n 50 12167 030 ...
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Page 289: ...Advanced Data Formatting 11 25 Numeric Keypad continued 7 8 9 Cancel ...
Page 334: ...11 70 Symbol PL4507 Decoder Integration Guide Send ALT Characters continued Send Alt Send Alt ...
Page 355: ...Advanced Data Formatting 11 91 Alphanumeric Keyboard Space Single Close Quote Dash ...
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