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J8. User-configuration jumper block
11
12
9
10
7
8
5
6
3
4
13
14
1
2
Circuit board
1
–6
7
8
9
10
11
–
20
Reserved.
Ext. spindle sync.
Clock ground
Remote LED +
Remote LED –
Reserved. Do not
use.
Pin
17
18
15
16
19
20
J12. Options jumper block
7
8
5
6
3
4
1
2
Circuit board
Pin Function
1 Ground
2 Parity enable
3 Ground
4 Remote start enable
5 Clock ground
6 External spindle sync.
7 Remote LED –
8 Remote LED +
Function
Figure 2. Front view
ST3390N, ST3655N Installation Guide, Rev. A 7