TI-85 Link Protocol Guide v1.0 - Manual Variable Transfers

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Manual Variable Transfers

The TI-85 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 |  |  |  | VAR
2 |  | ACK
3 |  | CTS or SKIP/EXIT. Do step 4 (send the ACK). Then if skip, skip to step 7, or if exit then stop.
4 |  | ACK
5 |  | DATA
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.

Example (PC sending variables to TI):

PC: | `05 06 05 00` `0A 00 00 01 41 4C 00` | Variable Header: Real Number "A"
TI: | `85 56 05 00` | Acknowledgement of header
| `85 09 05 00` | Clear to send variable
PC: | `05 56 00 00` | Acknowledgement of CTS
| `05 15 0A 00` `00 00 FC 62 83 18 53 07 18 00 5B 02` | Variable data: "6.28318530718"
TI: | `85 56 0A 00` | Acknowledgement of data
PC: | `05 06 05 00` `0A 00 00 01 42 4D 00` | Variable Header: Real Number "B"
TI: | `85 56 00 00` | Acknowledgement of header
| `85 36 01 00` `02 02 00` | Skip variable
PC: | `05 56 00 00` | Acknowledgement of variable skip
| `05 92 00 00` | No more variables
TI: | `85 56 00 00` | Acknowledgement of EOT

Screenshots | Table of Contents | Silent Transfers

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