Siemens 7 manual +++-Parser

Multiplexer Driver Developer’s Guide

7.5 The +++-Parser

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7.5The +++-Parser

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

Internal states of the ScanRequest Object for scanning each

character in a Send Request for one Port Object

if BreakCount > 0, then send first the breaks. After check for incoming Request also check if Break Count>0 and then '+' characters.

WAIT_CHAR()

Timeout 1s and

rcv. BreakChar '+'

SerMuxSend(), BreakCount=0 If rcv. a SendRequest, then

Flag = SCAN_LATERrcv. char. unequal '+' or Timeout 1s

or difference between current and last Request too big

PLUS

COMPLETE_PLUS

	rcv. any character
	with time differences over One
	second to the last character
	or the ScanRequest Timer go to zero	if rcv "++" then
Timeout
	in the Timer	BreakCount +1
WaitResponseTimer

if receive the MSC Response

if BreakCount = 3

Send MSC

command with ESCAPE =1

1.If the next incoming request has a TImeout to the last request,

W AIT_BREAK	then switch to WAIT_BREAK without	PLUS_TIMEOUT
	Timerfunction
	Request-Flag =SCAN_LATER
	2. if the ScanRequest Timer go to zero.

If rcv. a SendRequest, then
Flag = SCAN_LATER	if Timer go to 0:
	if STATE_WAIT_BREAK then STATE_WAIT_CHAR
if Timer go to zero:

if STATE_PLUS then STATE_WAIT_CHAR

if STATE_PLUS_TIMEOUT then STATE_WAIT_BREAK

ScanRequest	ScanRequest
	->WaitResponse
->Timer
	Timer

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

Mux_Drv_DevGuide_v07	Page 34 of 36	2006-9-27
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