The data is collected into packets and these packets are sent via RS-232 signals whenever the host computer requests data. Host computer programming. The SEC-232m is designed to produce 16 byte packets when the host computer requests data from it. The host computers task of data verification and decoding is greatly simplified by the use of Biased Binary data. Packets containing currant counter and timer data are formed whenever a predetermined event occurs.
Events can be data transitions on input pins or host commands.
The packets are stored in a queue until the host computer polls for data. When a poll command is received the packets stored in the queue are sent in the order that they occurred. The serial port connector is a male DB-25 wired to connect directly to a PC standard 25 pin serial connector. Appropriate wiring adaptors are available to allow connection to other RS-232 port standards. There is buffer space for six packets.