MOST High Protocol Service

In addition to Layer I and Layer II of the MOST NetServices, the MOST High Protocol Service (MHP) provides an alternative transmission path for packet data transfer, including an additional security layer. It allows large data packets of up to 64 KBytes to be sent and received. An acknowledgment mechanism provides a security layer to ensure data integrity.

MOST High Protocol Service interfaces to the Control Message Service (V1.x only: CMS), as well as to the Asynchronous Data Transmission Service (V1.x: ADS; V2.x/V3.x: WADS). So transmission can be done either via control channel, or the asynchronous channel of a MOST network.

Note: The V2.x/V3.x of the MOST NetServices supports asynchronous data transmission only.

MOST High Protocol consists of a separate transmit and receive section, allowing for reduced code when only one section is needed by a device. The transmit and receive sections can also be combined to enable full duplex transmissions. Configuration files allow the MOST High Protocol Service to be adapted to different application and platform requirements.

Features

• Provides data integrity to packet transport on the MOST network
• Unlimited number of simultaneous connections
• Flexible segmentation and acknowledgement mechanism
• Transmissions can be paused or aborted by sender or receiver
• Notification of application with transmission status
• Input buffer can be locked by the application
• Debug interface
• Callback function for getting information about the status of connections
• Interface to basic transmission services including Control Message Service (CMS), Asynchronous Data Transmission Service (ADS) and alternative packet driver
• Error handling and notification