Serial Timeout Strange Issues

[mackrackit]

Noise should not be the problem then.

Post your code and we will see if there is anything there.

[Archangel]

I am guessing you are powering the pics from the same supply as the servo. A little electric motor like that can generate some serious voltage (back EMF) and distribute it back into the power supply. I would power them seperately and tie the grounds all at a single place.

[Corbet]

No the servos and chips have seperate power supplies with connected ground as I ran into that problem before
Here is my code

Receiver

Define osc 4
trisa = %000000
trisb = $00
low portb
t1pulse var byte[6]
t1pulse[0] = 90
t1pulse[1] = 90
t1pulse[2] = 90
t1pulse[3] = 90
t1pulse[4] = 90
t1pulse[5] = 90
porta.1 = 1
porta.2 = 0
trisa.3 = 1

Main:
porta.2 = 0 'turns on a transistor that brings pin on sender high
'to stop it from sending the serial

pulsout portb.3,t1pulse[0] + 60 'pulsout for servos
pulsout portb.2,t1pulse[1] + 60
pulsout portb.1,t1pulse[2] + 60
pulsout portb.4,240 - t1pulse[3]
pulsout portb.5,240 - t1pulse[4]
pulsout portb.6,240 - t1pulse[5]

porta.2 = 1 'turns transistor on to bring sender pin low to
'tell sender to send

Serin2 porta.3,84,15,Comfail,[wait ("@"), str t1pulse\6] 'if timeout length
' is longer than the time between the sends
'on the sender, this line hangs up and chip
'acts weird like turning porta.2 on but not
' sending the pulses or turn on servo pins
' and never turn off

porta.2 = 0 'tell sender to stop sending

goto main 'loop to main

Comfail: 'if sendin timesout, go here.
Porta.2 = 0 'tell sender to stop sending
goto main 'goto main

The sender does some calculations and sends an array of size 6 through a pin and doesn't do anything else with that pin, just serout2 and then continues on with the program. If the time it takes the sender to send is longer than the timeout the receiver doesn't work correctly.

[Archangel]

Here is a shot in the dark.
You have not posted any config fuses in your code so I am free to assume you are allowing your code to use the Default configs which are located in the 16F84.inc file found in your PBP root directory.
This is the default MPASM config:
__config _XT_OSC & _WDT_ON & _CP_OFF
and here is the PM default config:
device pic16F84, xt_osc, wdt_on, protect_off
it defaults to WDT_ON, I think your code is hanging waiting and the WDT resets and the follies begin. You should early in your PIC programming career learn how to set them in your code so there are no surprises.
It is explained in this thread:
http://www.picbasic.co.uk/forum/showthread.php?t=543

[Corbet]

I tried turning off the watchdog timer and it didn't change. Thanks for the sggestion.

[Archangel]

Ok, well different theory,
try using a pullup resistor and change mode from 84 to 32852, it is still 9600 True but with open collector instead of driven high.
Try adding
DEFINE CHAR_PACING 1000
in transmitter code.

[Corbet]

I added a 10k resistor between the +5 PIC source and the serial wire and changed the 84 to 32852 and it is getting more motion than before but not much more. the servos are all over the place for a biut but then they do what I want for a little. I have 3 serial wires going from the transmitter to 3 receiver chips that control the servos and they are all wired the same just going to different pins on the transmitter. Sometimes two out of three will do as described before but the third for some reason doesn't do anything. I verified on an oscope that the transmitter is sending data and for it to send that means the receiver is giving the signal to receive, it just isn't receiving because the servos are staying at their set default of 90 degrees which I programmed in to the receivers in case the transmitter stops.
To me it seems the receivers are sending the go ahead, the transmitter is sending, but the receivers aren't receiving.