Magtek MAGTEK User Manual download pdf (Page 55)

Section 5. Application Programmable Interface

COMMANDS

Host applications access device functions by communicating with a specific device application

running on the device. Each device application is identified by a numeric application ID which is

unique for the device. Every device application defines the command set that it understands and

can process. Commands are identified by a numeric command ID and may contain additional

data needed to process the command. The command ID is unique for the given application.

The device responds to commands within short, finite amount of time as defined by the

Core.RspTimeout for the device. The response contains a result code that indicates whether the

command was completed successfully, and if not, what was the reason for failure. The response

may also contain additional data to be returned to the host application. If the device response is

not received in the Core.RspTimeout time period, the MCP driver will fail the command request.

MCP driver handles the process of issuing a command request to the device and receiving the

device response, so from the viewpoint of the host application, the act of sending the command

and receiving the response is a single action. To execute a command, the host application uses

the API McpCall function.

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Magtek MAGTEK User Manual Page 55