BSI - BS 6556-1
Low Speed Digital Signals for Use in Coal Mines - Part 1: Specification for Optical Coupling
|Publication Date:||31 January 1985|
|ICS Code (Electrical apparatus for explosive atmospheres):||29.260.20|
Defines electrical input and output characteristics of intrinsically safe transmitting and receiving circuits forming a low speed digital data transmission link in which data is transmitted using current loop techniques.