HMS91C7432

TCP/IP protocol suite is the key to inter-net access. Email; Home Page materials and all the data traffic on the inter-net are carry out by using the TCP/IP well defined format. Time before HMS91C7432 exist, most internet connection were to be handled by the PC.

Hand held devices and equipments must be attached to the PC to get access to the inter-net. Now the era of "PC-free" inter-net connection has come. With HMS91C7432, you can make your product be able to send and receive email; surf on the WWW and even "TALK" to another device through the inter-net, by just plugging the telephone line onto it.

The core of the HMS91C7432 is a complete TCP/IP protocol suite. Files and messages pass to it will be transformed into the appropriate format and packets to conform the inter-net standard. This transformation is transparent to the user's application.

On top of the TCP/IP core, there is an Email engine built-in. User's program just needed to inform it an email is going to send and follow with the email body. It will then wake up the modem and dial the ISP to log on the mail server. The mail will be sent when log on has success. HMS91C7432 complete this whole process fully automatic.

Reception of Email is as simple as getting email on the PC. The application program send a "Receive Email" command to it, it dial up the ISP and log on the server, then it check and download any email automatically. Each message will be stored in the RAM buffer, HMS91C7432 will notify the application program an email has come and waiting for retrieve.

The built-in PPP module handles the "Log on process". This is a standard protocol to pass the user's account ID and the password to the ISP. This module handles the authentication and "Handshaking". User's program just pass the user's ID and password to HMS91C7432 and the PPP do it all.

HMS91C7432 (later version only) also equip with a FTP module to facilitate file transfer and file downloading from the FTP site. This function is especially good for remote system update and game download for hand-held game inter-net access.

The standard serial DTE interface on the HMS91C7432 ease the modem connection. The built-in modem driver support V.90 and 56K flex dual modem or lower.

HMS91C7432 is controlled by an 8 bit data/command port. This port accepts command passed by the host MCU. Incoming and outgoing message will be passed between the host and the HMS91C7432 through this port as well.