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Sensoray Model 425 Instruction Manual Page 12

Relay Interface

I/O Channel

Local

Data

Bus

One of 48 Digital I/O Channels

O.C.

Relay Access Ports

The 48 relay channels are accessed through three

bidirectional I/O ports. Each port accesses 16

channels simultaneously:

Reading from a Relay port returns the physical state

of the channels associated with that port. Writing to a

Relay port programs the associated relay channel

output registers.

Note: the value read from a relay channel may not be

the same as the value stored in that channels output

output register is programmed to 0 and an external

sink pulls the corresponding channel down to 0V.

Configuring I/O Type

Each channel may be independently configured as

either an input or output. To configure a channel as

an input, zero the associated channel register.

Relay 0-15 port (base + 24, read/write)

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0

Relay 31-16 port (base + 26, read/write)

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

R31 R30 R29 R28 R27 R26 R25 R24 R23 R22 R21 R20 R19 R18 R17 R16

Relay 47-32 port (base + 28, read/write)

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

R47 R46 R45 R44 R43 R42 R41 R40 R39 R38 R37 R36 R35 R34 R33 R32

Connections

All electrical connections are made through 50-pin

connectors P3 and P1. On each of these connectors,

one pin is assigned to each active-low I/O channel.

All even pins are connected to ISAbus five volt return.

In addition, pin 49 may be used to supply limited five

volt power (<100mA) to an external relay rack.

Pin P1 P3

1 CH23 CH47

3 CH22 CH46

5 CH21 CH45

7 CH20 CH44

9 CH19 CH43

11 CH18 CH42

13 CH17 CH41

15 CH16 CH40

17 CH15 CH39

19 CH14 CH38

21 CH13 CH37

23 CH12 CH36

25 CH11 CH35

27 CH10 CH34

29 CH9 CH33

31 CH8 CH32

33 CH7 CH31

35 CH6 CH30

37 CH5 CH29

39 CH4 CH28

41 CH3 CH27

43 CH2 CH26

45 CH1 CH25

47 CH0 CH24

49 +5V +5V

Even GND GND

The 425 board provides 48 high-current digital

I/O channels designed for direct interface to

industry standard relay racks.

As shown in the diagram to the right, each relay

channel is physically structured as a write-only

(with 10Kohm pullup), which in turn is looped

back to the local data bus by a 3-state buffer.

Channel data is active-high on the local bus side,

and active-low on the I/O channel side.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 33 34

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