Serin2 Timeout

[mackrackit]

Well, looking at SERIN2 and Appendix A, with the formula being (1000000/)-20
Appendix A states:
2400 Driven Inverted None 16780
9600** Driven Inverted None 16468
taking the formula and coming up with 188.3333333333etc...
I figure by looking at the examples 16780-188=16592.

SERIN2 serpin,16780,[wait(254),address1,address2,mydata1,mydata2,chk_su m]
changed to this:
SERIN2 serpin,16592,[wait(254),address1,address2,mydata1,mydata2,chk_su m]
So am I correct by saying 48000 bps would be 16592?

Thank you

Nope.

The numbers for the mode setting have been converted to decimal. We need to look at this from a binary point of view. If you do not have a handle on base2, things will be difficult with computers. The computer only understands two things, ON and OFF as in a switch, and most times with micros we can get away with thinking of 8 switches in a group, (or pins)

As you know with you PIC, the group of 8 is represented as bits 0 - 7.
With the SERIN2 modes we are talking about 16 switches, bits 0 - 15.

The table at SERIN2 in the manual gives the first 12 (0-12)bits of the mode and a formula to find this number.

Baud        0-12 bits  Binary
2400        396         0000110001100
4800        188         0000010111100

Now we have bits 13 - 15.
Bit 13 is for parity. 0=None 1=Even
Bit 14 is for conversion. 0=True 1=Inverted
Bit 15 is the Output. 0=Driven 1=Open

Go to appendix A and look at Mode Number 16780. We will build this from scratch.
Bit 15 is Driven = 0
Bit 14 is Inverted = 1
Bit 13 is No parity = 0
Take bits 0-12 from above 2400 baud and put it all together.
0100000110001100
and convert to Decimal = 16780

Now for Driven Inverted None 4800.
Bits 15 - 13
010
Bits 0-12 from above 4800
0000010111100
Put it together
0100000010111100
Convert to Decimal
16572 is the Mode Number for Driven Inverted None 4800 Baud.

I hope

Here is a page to do the conversions.
http://acc6.its.brooklyn.cuny.edu/~g.../nav2tool.html

[tazntex]

Hello,
What about SEROUT2? I am using:
serout serpin,N2400,[$55,$55,$55,$55,$55,$AA,$AA,$AA,$AA,$AA,synch,addr ess,address,keydata,keydata,chk_sum]

and I want to increase it to 4800bps. The manual speaks of this in SEROUT2 and Appendix A,
and I think I''ve got my bugs cornered up in my other post so I wanted to go a little faster.

serout2 serpin,16592,[$55,$55,$55,$55,$55,$AA,$AA,$AA,$AA,$AA,synch,addr ess,address,keydata,keydata,chk_sum]

16592 about what I've calculated for 4800bps, now what do I do with the synch, its value is 254 and do I have this formated right?

Thank you

Must be something to the address when I typed it, doesn't have a space

[Archangel]

Thanks Mackrackit,
nice little tutorial.

[skimask]

Hello,
What about SEROUT2? I am using:

OPEN/LOOK IN THE BOOK!
SERIN2 and SEROUT2 are the same!!!

And a little bit more reading would show that you could also save quite a bit of typing.

This line:
serout serpin,N2400,[$55,$55,$55,$55,$55,$AA,$AA,$AA,$AA,$AA,synch,addr ess,address,keydata,keydata,chk_sum]

could act the same as:
serout2 serpin , mode , [ REP $55\5 , REP $AA\5 , synch , REP address\2 , REP keydata\2 , chk_sum ]

[mackrackit]

16592 about what I've calculated for 4800bps

But we are not talking about hand grenades

now what do I do with the synch, its value is 254 and do I have this formated right?

What do you think the synch does for you? And what does all of the $55,$AA do?

The $55,$AA s are what I would call the synch(ronizing) part. This prepares the internal workings of the receiver to a "neutral" state ready to receive "highs" and "lows".

I do not see what your synch is doing for you. You could use it as the wait variable, but then you will most likely want a time-out then to go with it.

In your case I would "synch" the receiver with the $55,$AA s and send the remaining data dropping the variable holding 254.

Play with it

[tazntex]

Thanks for the suggestion from both of you. I started out with an example from Bruce's website, Rentron, and I my thinking was the 254 was the qualifier. So, I thought by using a qualifier one tx work be matched to its own rx then if I built two neither would interfere or operate the other. The main question I was asking was Using SERIN2 baud being 4800bps the mode would be 16572. On the receiver I would use this:
SERIN2 serpin,16572,[wait(254),address1,address2,mydata1,mydata2,chk_su m]
Return

What I would like to know is using SERIN at 4800bps changing the above line for SEROUT it does not work. I see in the manual what is says for the calcultion etc for SEROUT2 but not for SEROUT. If I do this:
SEROUT serpin,16572,[wait(254),address1,address2,mydata1,mydata2,chk_su m]

Hmmm,....I hope this make sense, haven't had my coffee yet.

Thanks

BTW, Skimask, I see your point in using colons. Finding mistakes, typos etc is easier.

[skimask]

What I would like to know is using SERIN at 4800bps changing the above line for SEROUT it does not work. I see in the manual what is says for the calcultion etc for SEROUT2 but not for SEROUT. If I do this:
SEROUT serpin,16572,[wait(254),address1,address2,mydata1,mydata2,chk_su m]

And yet again, it's in the book!

SERIN/SEROUT use one style of mode, SERIN2/SEROUT2 use a different style of mode. They are wholly different...

It's in the book!