Remote-processing RPC-2350 Instrukcja Użytkownika Pobierz pdf (Strona 36)

CHAPTER 6 DIGITAL LINES

6-3

Figure 6-3 IDC pin out viewed from top

lines. The MPS-XX series boards accept OPTO-22 G4

series or Grayhill G5 modules. See Chapter 18,

RESOURCES , for a list of suppliers.

Use the O PTO comm and to access and control opto

modules. The LIN E comm and is used to access

individual lines on the STB-26 or MPS-X X rack.

A CM A-26 connects J2 and J3 on the RPC-2350 to the

MPS-XX board. Cable length should be less than 2 feet

for the 8 position rack and 18 inches for the 16 and 24

positions. Excessive cable lengths cause a high voltage

drop and conseque ntly unreliab le operation. Be sure to

supply + 5V and ground to the appropriately marked

terminals.

You must configure the 8255 ports for outputs before

using them. Use the following table to determine the

corresponding opto channel for a particular 82C 55 port:

Opto

channe ls

82C55

port

Connector Addr.

M0-M3 Lower C J2 2

M4-M7 Upper C J2 2

M8-M15 A J2 0

M16-M23 B J2 1

M100-M103 Lower C J3 66

M104-M107 Upper C J3 66

M108-M115 A J3 64

M116-M123 B J3 65

"Opto channel" is the position as marked on the MPS-xx

board. The channel number is preceded by a 'M'

character on the MPS board. When connecting J3 to an

opto rack, add 100 to the number on the rack. J3 has a

high current output on port A (channels M8-M15).

Replace U20 with a shunt jumper to operate norm ally.

To turn on an opto module, an output line must be low.

A module is turned off by wr iting a ' 1' to a channel.

The logic at J3 port A, with the high cur rent outputs

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

module to turn ON.

High cur rent outputs at J3 port A are optionally

configurable as TTL I/O by replacing U20 with a DIP

shunt jumper. This keeps logic compatible with ports B

and C. If opto channels 8-15 are used as inputs, then

U20 must be replaced by a DIP shunt jumper.

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 sour ce 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 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) :'Get status port A

210 F = OPTO(101) :'Read opto module,

ch. 1

220 OPTO 103,ON :'write module 3

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

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

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

260 LINE 4,1 :’Set line # 4 to 1

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 82 83

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