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DIGITAL LINES CHAPTER 6

Page 16 RPC-150

The logic at J2 port B, with the high current outputs

installed is just the reverse. A ' 1' at a line causes the

module to turn ON. The OPT O command sets the

output to the proper polarity when U13 is r eplaced w ith

a dip shunt jumper.

High cur rent outputs at J2 port B ar e optionally

configurable as TTL I/O by replacing U13 with a DIP

shunt jumper. This will keep the logic com patible with

ports A and C . If opto chan nels 0-6 are used as inputs,

then U13 must be replaced by a DIP shunt jumper.

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 J2 and J3 are connected to the STB-26 with a CMA-26

ribbon cable. Digital devices are then connected to the

screw terminals on the STB-26.

Switches m ay be connected directly to a line. 10K pull-

up resistors on board set all inputs high, or 1. A switch

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

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

(J2-25), reads an opto module at channel 1 and writes an

opto module at channel 5. A LE D is controlled at J2-10

(port B, bit 0).

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

210 F = OPTO(101) :'read opto module, ch. 101

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

230 BIT 1,0,0 :'turn on led at J2-10

240 BIT 1,0,1 :'turn off led at J2-10

250 A = LINE(103) :'Reads pin 3 at J2

260 LINE 114,1 ;'Set line 114 high

Conne ctor pin ou t - J2

Pin # 82C55 Description Opto

Port Channel

19 Port A, line 0 108

21 Port A, line 1 109

23 Port A, line 2 110

25 Port A, line 3 111

24 Port A, line 4 112

22 Port A, line 5 113

20 Port A, line 6 114

18 Port A, line 7 115

10 Port B, line 0 High current 100

8 Port B, line 1 High current 101

4 Port B, line 2 High current 102

6 Port B, line 3 High current 103

1 Port B, line 4 High current 104

3 Port B, line 5 High current 105

5 Port B, line 6 High current 106

7 Port B, line 7 not available

13 Port C, line 0 Shared with J5 116

16 Port C, line 1 Shared with J5 117

15 Port C, line 2 Shared with J5 118

17 Port C, line 3 Shared with J5 119

14 Port C, line 4 Shared with J5 120

11 Port C, line 5 Shared with J5 121

12 Port C, line 6 Shared with J5 122

9 Port C, line 7 Shared with J5 123

26 Ground

2 +5V

Opto Channel is computed by adding 100 to the number

on the MPS rack. The position number is preceded by

the letter 'M ' on the rack.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 24 25 26

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