Command 0X0A - Set Session Id (Msr Only) - Magtek eDynamo Programmer's Manual

8 - Commands

8.3.5 Command 0x0A - Set Session ID (MSR Only)

This command is used to set the current Session ID, which the device transmits to the host in the
Encrypted Session ID. The new Session ID stays in effect until one of the following occurs:

The host sends the device another Set Session ID command.

The device is powered off.

The device is put into Suspend mode.
The Session ID is used by the host to uniquely identify the present transaction. Its primary purpose is to
prevent replays. After the device reads a card, it encrypts the Session ID along with the card data, and
supplies it as part of the Magnetic Stripe Card Data Sent from Device to Host. The device never
transmits a clear text version of this data.
Table 8-10 - Request Data for Command 0x0A - Set Session ID (MSR Only)
Offset Field Name
0 New Session ID
Response Data: None
Result codes:
0x00 = Success
0x02 = Bad Parameter - The Data field in the request is not the correct length. The Session ID is an 8-
byte value, so the Data Length must be 8.
Example Set Session ID Request (Hex)
Cmd Num
0A
Example Set Session ID Response (Hex)
Result Code
00
eDynamo| Secure Card Reader Authenticator | Programmer's Manual (COMMANDS)
This eight byte value may be any value the host software wishes.
Data Len
08
00
Page 72 of 245 (D998200115-17)
Description
Data
54 45 53 54 54 45 53 54
Data Len Data