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Table 3: Pin Assignment: Enhanced Parallel Interface (on 25x2 IDE connector) (Continued)
17
ERROR
18
D1
19
1
GND
20
D2
21
1
GND
22
D3
23
1
GND
24
D4
25
/STROBE
26
D5
27
1
GND
28
D6
29
1
GND
30
/HOME
31
1
GND
32
2
DGND
33
2
+5 VDC
34
D7
35
2
+5 VDC
36
2
+5 VDC
37
NC
38
NC
39
RXTX-
40
RXTX+
41
Bus Enable
42
485 Shield
43
Trigger
Simplex (SK/SP Emulation) Mode: reset error output low = normal,
high = switch mechanism position check failed (channel position is
verified when SK switch is reset)
Enhanced Parallel Mode: ERROR asserted indicates an error code in
the SKB error queue
Data line 1
Shield
Data line 2
Shield
Data line 3
Shield
Data line 4
/STROBE input, active low: a high to low pulse = read data lines;
a high = ignore state of data lines. This line is internally pulled high
via 10 K ohm resistor to 5 VDC. For the SK emulation the home line
is also read in via the STROBE signal
Data line 5
Shield
Data line 6
Shield
Home input: low sends the switch to the home position in Simplex
(SK/SP emulation) mode (Replaces RESET line in emulation mode)
Shield
Digital ground, RESERVED FOR SK/SP EMULATION/ Power on
2x25
RESERVED FOR SK/SP EMULATION/ Power on 2x25
Data line 7
RESERVED FOR SK/SP EMULATION/ Power on 2x25
RESERVED FOR SK/SP EMULATION/ Power on 2x25
No connect
No connect
Transmit/receive data negative side (A)
Transmit/receive data positive side (B)
Active high parallel bus enabler
RS485 signal shield
Active low trigger signal, TTL multi-dropped, pulled UP at slave with
100K
Installation and Physical Interface
21
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