Reference Guide

Table Of Contents
Contents
10
USB Polling Interval.............................................................................................. 180
USB Fast HID ....................................................................................................... 182
IBM Specification Version..................................................................................... 182
ASCII Character Sets for USB ..................................................................................... 182
SSI Interface.................................................................................................................................... 183
Introduction .................................................................................................................. 183
Communications .......................................................................................................... 183
SSI Transactions.......................................................................................................... 185
General Data Transactions................................................................................... 185
ACK/NAK Handshaking ................................................................................. 185
Transfer of Decode Data ...................................................................................... 186
ACK/NAK Enabled and Packeted Data.......................................................... 186
ACK/NAK Enabled and Unpacketed ASCII Data ........................................... 186
ACK/NAK Disabled and Packeted DECODE_DATA...................................... 187
ACK/NAK Disabled and Unpacketed ASCII Data .......................................... 187
Communication Summary............................................................................................ 187
ACK/NAK Option .................................................................................................. 187
Serial Response Time-out .................................................................................... 187
Retries .................................................................................................................. 187
Response Time-out, ACK/NAK Handshake ......................................................... 188
Errors.................................................................................................................... 188
Things to Remember When Using SSI Communication .............................................. 188
Encapsulation of RSM Commands/Responses over SSI ........................................... 189
Command Structure ............................................................................................. 189
Response Structure.............................................................................................. 189
Example Transaction............................................................................................ 190
Command from Host to Query Packet Size Supported by Device................. 190
Response from Device with Packet Size Information .................................... 190
Command from Host to Retrieve Diagnostic Information............................... 190
Response from Device with Diagnostic Information....................................... 190
Simple Serial Interface Default Parameters ................................................................ 191
SSI Host Parameters ................................................................................................... 192
Select SSI Host .................................................................................................... 192
Software Handshaking ......................................................................................... 194
Decode Data Packet Format ................................................................................ 194
Host Serial Response Time-out............................................................................ 196
Host Character Time-out ...................................................................................... 197
Multipacket Option................................................................................................ 198
Interpacket Delay.................................................................................................. 199
Event Reporting .......................................................................................................... 200
Decode Event ....................................................................................................... 200
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