TI-89 Link Protocol Guide - Manual Variable Transfers

Manual Variable Transfers

The TI-89 uses manual transfer protocols when it is in Link mode. On the sending unit a user must choose the variables to be sent, and the receiving calculator must be put into a special reception mode.

The protocol for all manual variable transfers is shown below. For information on packet formats, click here.

A computer can be either the sending unit or the receiving unit.
Step Direction Packet
1 
Sending Unit
===>
Receiving Unit
 VAR (specifing the size without the extra four bytes).
2 
<===
 ACK
3 
<===
 CTS or MEM. If MEM, then stop.
4 
===>
 ACK
5 
===>
 DATA with an extra four bytes at the beginning.
6 
<===
 ACK
7 
===>
 EOT or another VAR. If var, go to step 2.
8 
<===
 ACK

The data packet contains the variable data. For information on variable formats, click here.

Examples (PC sending variables to TI):
PC: 08 06 07 00 06 00 00 00 00 01 7A 4C 00 Variable Header: Expression "z"
TI: 98 56 00 00 Acknowledgement of header
  98 09 00 00 Clear to send variable
PC: 08 56 00 00 Acknowledgement of CTS
  08 15 0A 00 00 00 00 00 00 04 67 02 02 1F 8E 00 Variable data: "6.28318530718"
TI: 98 56 00 00 Acknowledgement of data
PC: 08 92 00 00 End of transmission
TI: 98 56 00 00 Acknowledgement of EOT
     
PC: 08 06 07 00 06 00 00 00 00 01 79 4B 00 Variable Header: Expression "y"
TI: 98 56 00 00 Acknowledgement of request
  98 36 05 00 05 00 01 00 00 06 00 Out of memory
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