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CHAPTER 6 DIGITAL AND OPTO PORTS

RPC-30 Page 23

Interfacing to switches and other devices

The STB-26 terminal board provides a convenient way

of interfacing switches or other digital I/O devices.

Lines at J3 are connected to the STB-26 with a CMA-26

cable. Digital devices are then connected to the screw

terminals on the STB-26.

Switches may be connected directly to a line. When

jumper W6 configures the resistors as pull ups, a switch

closure to ground at a line is read as a 0.

When W6 configures the input resistors as pull downs,

one end of the switch must be tied to + 5 volts. If this is

not possible or convenient, a 1K resistor can be tied

between an input and + 5 volts to force it high when a

switch is open.

Configuring digital I/O lines

Lines are configured during program execution using the

CONF IG PIO command. On power up or reset, all lines

are inputs.

When a line is configured as an output, it can sink a

maximum of 2. 5 mA at 0. 4V and can source a minimum

of 2.5 ma at 2. 4V. W hen driving opto modules, the

outputs sink 15 mA at 1.0V.

Digital I/ O prog ramm ing exam ple

The follow ing exam ple reads a switch at port A, bit 3

(J3-25), reads an opto module at channel 1 and writes an

opto module at channel 5. A LE D is controlled through

the high current port at J3-10 (port B, bit 0).

200 D = BIT(0,3) :'Read switch status, port A

210 F = OPTO(1) :'read opto module, channel 1

220 OPTO 3,ON :'write module, channel 3

230 BIT 1,0,1 :'turn on led at J3-10

240 BIT 1,0,0 :'turn off led at J3-10

250 A = LINE(3) :'Reads pin 3 at J3

Conne ctor pinou t - J3

Pin # 82C55 Description Opto

Channel

19 Port A, line 0 8

21 Port A, line 1 9

23 Port A, line 2 10

25 Port A, line 3 11

24 Port A, line 4 12

22 Port A, line 5 13

20 Port A, line 6 14

18 Port A, line 7 15

10 Port B, line 0 High current 16

8 Port B, line 1 High current 17

4 Port B, line 2 High current 18

6 Port B, line 3 High current 19

1 Port B, line 4 High current 20

3 Port B, line 5 High current 21

5 Port B, line 6 High current 22

7 Port B, line 7 High current 23

13 Port C, line 0 Lower C 0

16 Port C, line 1 Lower C 1

15 Port C, line 2 Lower C 2

17 Port C, line 3 Lower C 3

14 Port C, line 4 Upper C 4

11 Port C, line 5 Upper C 5

12 Port C, line 6 Upper C 6

9 Port C, line 7 Upper C 7

26 Ground

2 +5V

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 37 38

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Remote-processing RPC-30 Manual de usuario Pagina 25

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