Communication boards serial interfaces

Figure 3 Functional scheme of recording block (microcontroller) 1- GPU, 2-ROM, 3-RAM, 4- timer, 5 - power supply, C - bus, 7-11 - PIA, 12 - serial interface, 13- key-board/display, 14-17 - voltmeter, 18 - P-sensor, 19- T-sensor, 20- V-sensor, 21- sample, 22 - port RS-232S (communication with computer).

The miscellaneous board is responsible for various activities such as communication with the keyboard and communication with external units through the serial interface RS-232 or TTY. 

The A/D board can reside either in the detector, an interface box, or in the computer. If the board is in the computer, it will have analog input terminals similar to a strip chart recorder or it will be connected to an interface box that will have this type of connector. If the A/D card is in the detector, the detector will have some type of digital interface port and a cable to connect it to the computer. In the personal computer world, once the signal is digitized outside the computer, it will be sent to the computer over one of three types of communication cables parallel, serial, or GPIB. 

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