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The serial interface RS 485 on the rear panel of
the feeder terminal is intended for connection to
the SPA bus (Rx/Tx). The SPA bus is connected
by means of a connection module type SPA-ZC
17_ or SPA-ZC 21_. The bus connection mod-
ule SPA ZC 21_ is fitted to the 9-pole D-type
subminiature connector and screwed to the rear
panel. The connection module type SPA-ZC
X6
X5
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
12
13
14
15
16
17
18
Rx
Tx
Fig. 9. Rear view of feeder terminal SPAC 531 C and SPAC 631 C
X4
X3
1
1
2
2
3
3
4
4
5
5
6
6
Rx Tx
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
INTERLOCK
17
17
18
18
SPAC 531 C
X5
X6
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
12
13
14
15
16
17
18
SPAC 631 C
17_ is connected to the feeder terminal with the
cable included in the delivery of the module and
fastened to the wall of the switchgear cubicle
with screws.
The 9-pole D-type subminiature connector
INTERLOCK is reserved for future use.
X2
X1
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
X0
1
13
X2
2
14
3
15
1
4
16
2
3
5
17
4
6
18
5
6
7
19
7
8
20
8
9
9
21
10
25
28
11
12
26
29
27
30
X1
X4
X3
1
1
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
8
8
8
9
9
9
10
10
10
11
11
11
12
12
12
13
13
14
14
15
15
16
16
17
17
18
18
1
13
2
14
3
15
4
16
5
17
6
18
7
19
8
20
9
21
25
28
26
29
27
30
21
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