Seagate ST34501FC manual FC-SCA pin descriptions

Cheetah 4LP FC Installation Guide, Rev. B			25
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*	–Parallel ESI	TTl output
6*	Ground (-DRV present)
7*	Active LED out	Open collector out
8*	Reserved
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*	+Port A_in	Diff. PECL input pair
25*	–Port A_in