Siemens 7 User Manual download pdf (Page 34)

Multiplexer Driver Developer’s Guide

7.5 The +++-Parser

Mux_Drv_DevGuide_v07 Page 34 of 36 2006-9-27

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7.5 The +++-Parser

The following state diagram shows the states of the +++-parser.

Figure 10: State diagram of the +++-parser

Internal states of the ScanRequest Object for scanning each

character in a Send Request for one Port Object

PLUS

PLUS_TIMEOUTWAIT_BREAK

COMPLETE_PLUS

Timeout 1s and

rcv. BreakChar '+'

if BreakCount = 3

rcv. any character

with time differences over One

second to the last character

or the ScanRequest Timer go to zero

in the Timer

rcv. char. unequal '+'

or Timeout 1s

or difference between current and

last Request too big

1. If the next incoming request

has a TImeout to the last request,

then switch to WAIT_BREAK without

Timerfunction

Request-Flag =SCAN_LATER

2. if the ScanRequest Timer go to zero.

Send MSC

command with

ESCAPE =1

if receive the MSC Response

Timeout

WaitResponseTimer

if BreakCount > 0, then send first

the breaks. After check for incoming

Request also check if Break

Count>0 and then '+' characters.

SerMuxSend(), BreakCount=0

If rcv. a SendRequest, then

Flag = SCAN_LATER

If rcv. a SendRequest, then

Flag = SCAN_LATER

if Timer go to zero:

if STATE_PLUS then STATE_WAIT_CHAR

if STATE_PLUS_TIMEOUT then STATE_WAIT_BREAK

if Timer go to 0:

if STATE_WAIT_BREAK then STATE_WAIT_CHAR

WAIT_CHAR()

ScanRequest

->WaitResponse

Timer

ScanRequest

->Timer

if rcv "++" then

BreakCount +1

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