... in a numeric (usually binary) code. Analog Data, Digital Signals PCM Procedures 10 September 2 012 10 Pulse-amplitude modulation, acronym PAM, is a form of signal modulation where the message ... 1 Serial Communication EIA RS232, RS422 and RS485 Recommended Standard 232 The purpose of this course note is ... a time Full Duplex Transmission full duplex: send and receive both directions at once RS232 Analog ADC Line coding Digital transmission Sampling Quantization Coding RZ, NRZ, AMI...