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


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

Sending Unit

===>

Receiving Unit

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

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