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Sensoray Model 421 Instruction Manual Page 9

Relay Interface

I/O Channel

Local

Data

Bus

One of 48 Digital I/O Channels

O.C.

RELAYx Ports

The 48 digital I/O channels are organized as two

banks of three byte-wide ports. Each port accesses

eight relay channels simultaneously, and each bank

of three ports addresses 24 relay channels.

RELAY0 ( 8):

RELAY1 ( 9):

RELAY2 (10):

RELAY3 ( 16):

RELAY4 ( 17):

RELAY5 (18):

Each RELAYx port may be read from or written to

at any time. Reading from a RELAYx port returns

the physical state of the channels associated with

that port. Writing to a RELAYx 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 register. Specifically, the values will differ

if an 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 via software. To configure

a channel as an input, set the associated channel

Connections

All electrical connections are made through 50-pin

connectors P5 and P6. 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.

The 421 provides 48 high-current digital I/O

channels for direct interface to industry standard

relay racks.

As shown in the diagram to the right, digital I/O

channels are physically structured as open-

collector buffers (with pullup resistors) looped

back to the local data bus by tri-state buffers.

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

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

Connectors P5 and P6: Digital I/O

Pin Name Function

1 CH23 I/O Channel 23

3 CH22 I/O Channel 22

5 CH21 I/O Channel 21

7 CH20 I/O Channel 20

9 CH19 I/O Channel 19

11 CH18 I/O Channel 18

13 CH17 I/O Channel 17

15 CH16 I/O Channel 16

17 CH15 I/O Channel 15

19 CH14 I/O Channel 14

21 CH13 I/O Channel 13

23 CH12 I/O Channel 12

25 CH11 I/O Channel 11

27 CH10 I/O Channel 10

29 CH9 I/O Channel 9

31 CH8 I/O Channel 8

33 CH7 I/O Channel 7

35 CH6 I/O Channel 6

37 CH5 I/O Channel 5

39 CH4 I/O Channel 4

41 CH3 I/O Channel 3

43 CH2 I/O Channel 2

45 CH1 I/O Channel 1

47 CH0 I/O Channel 0

49 +5V +5V power

Even GND 5V return

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 26 27

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