1851 SITO/City & Guilds masterclass [part 20] - Access: and the single door | Archive Titles

Table 1
Device	Core	Description
Door locks/strikes	2 core	1 x Voltage +
		1 x Voltage -
Locks/strikes with lock position monitoring door open sensors	4 core	1 x voltage +
		1 x voltage -
		2-3 x monitoring contact
	2 core	2 x monitoring contact
Token readers	6 core	1 x reader voltage +
		1 x reader voltage -
		1 x Data +
		1 x Data -
		2 x LED accept/reject control
Keypads or readers with keypads	5-10 core	See manufacturers data sheets
Printer cables	3+ core	1 x Transmit
		1 x Receive
		1 x Reference or “Ground”
		? x Other signals required for RS232c interfaces or parallel ribbon connector