Seagate ST19171FC manual FC-SCA pin descriptions

Barracuda 9FC Installation Guide, Rev. A					21
Table 1:		FC-SCA pin descriptions
	Pin/contact		Signal name	Signal type
1*			–EN bypass port A	TTL output
	2*		12 Volts
3*			12 Volts
	4*		12 Volts
5*			Reserved NC
	6*		Reserved NC
7*			Active LED out	Open collector out
	8*		Reserved NC
9*			RMT_start	TTL input
	10*		DLYD_start	TTL input
11*			–EN bypass port B	TTL output
	12*		SEL_6	TTL input
13*			SEL_5	TTL input
	14*		SEL_4	TTL input
15*			SEL_3	TTL input
	16*		Fault LED out	Open collector out
17*			Reserved NC	TTL input
	18*		Reserved NC
19*			5 Volts
	20*		5 Volts
21			12 Volts charge
	22		Ground
23			Ground
	24*		+CH1_in	Diff. PECL input pair
25*			–CH1_in