Remote Processing RPC-150 - Manual (Page 18)

DIGITAL LINES CHAPTER 6
Page 16 RPC-150
The logic a t J2 port B, with the high c urre nt outputs
installed is just the reverse. A ' 1' at a line causes the
module to turn ON. The OPT O comm and sets the
output to the pr oper po larity wh en U13 is r eplaced w ith
a dip shunt jumper.
High cur rent outpu ts at J2 port B ar e optionally
configurable as TTL I/ O by replacing U13 with a DIP
shunt jump er. This will kee p 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. D igital devices are then connected to the
screw term inals on the STB-26.
Switches m ay be conne cted direc tly 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 progr am 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 read s a switch at po rt 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 rac k. The position number is preceded by
the letter 'M ' on the rack.