Command 0Xd821 - Start Get File From Device - Magtek DynaFlex II Go Programmer's Manual

6 - Commands
Table 6.6-12 - Request Example
AA 00
81 04 01 07 D8 12
84 44
D8 12
81 04 02 00 00 00
A2 2B
81 04 00 02 58 38
82 01 04
83 20
D5 B8 BF 2F 3A 15 D9 EE 1D 0D E5 8E DD 68 37 73
18 51 C7 3C 3D 79 58 2B A6 07 90 5C 2B 86 3C E5
A3 0A
81 08 30 32 30 30 30 30 30 30 87 01 01
Table 6.6-13 - Response Example
AA 00 81 04 82 07 D8 12 82 04 00 00 00 00

6.6.5 Command 0xD821 - Start Get File from Device

The host uses this command to request a file stored on the device. File types include standard files
(images and certificates), MagTek custom files (configuration, firmware), and in some cases even large
data blob output (such as signature capture data). In many cases, the files retrieved by this command have
been sent by a host previously using Command 0xD811 - Start Send File to Device (Secured) or
Command 0xD812 - Start Send File to Device (Unsecured). In other cases, such as retrieving
signature capture data, the data may originate with the device and the host uses this command to retrieve
it. Such data and is not persistent, in the sense that the device does not retain it through power cycles.
The sequence of events is as follows:
1) The host composes a command request in the format below, and sends it to the device.
2) The device sends a response in the format below so the host knows it can begin listening for a file
message.
3) The device sends a Data File Message to the host. If the host does not receive file data within a
reasonable period of time, it should time out and stop listening for the data file.
4) Upon receiving the end of the Data File Message, the host should check to make sure the File ID,
length, and hash of the File Payload in the Data File Message match the values the device specified
in its response to ensure the file has not been tampered with.
Table 6.6-14 - Request Data for Command 0xD821 - Start Get File from Device
Tag Len
Beginning of any wrappers, at minimum including Request Message found on page 32
D821 = Command 0xD821 - Start Get File from Device
81 04 File ID from Table 6.6-1 - File Types
DynaFlex II Go| Secure Card Reader | Programmer's Manual (COMMANDS)
Example (Hex)
Example (Hex)
Value / Description
Page 134 of 301 (D998200597-102)
Typ Req Default
B R