Help guys...communication issue, I think?
Hello all,
I'm back here posting due to some massive brain fry over my latest project. Here's what I've got:
PC to a Trendnet TU-S9 (USB to RS232 adapter).
From there, into a custom board with a MAX232 to a MAX3081 RS422 chip (Rx+, Rx-,Tx+,Tx-,Ground).
From there, into board(s) that have a MAX3081, which are then tied into the USARTs of the MCUs.
All of the RS422 wiring is over Cat5e with RJ-45 connectors.
Each board has 2 RJ-45 connectors, wired in parallel, to facilitate a daisy chain configuration.
At present, I have 2 boards: 1 that does ADC stuff (PIC16F1936), and the other that does strictly outputs (PIC16F887).
I think that gets the hardware out of the way.
As far as the software, I'm running them with Term.exe @ 57600,8,N,1.
Here's where it gets weird
When I plug either board in by itself, all is good (receive from the PC and transmit back from the MCU)
When I plug both boards in (daisy chained), both boards receive from the PC just fine but
I can only receive a response back from my 887 output board, although I can send commands just fine to both
of them. I verify this by manually switching some outputs on the 1936 board. When I expect a serial response
from the 1936 board, all I seem to receive at the terminal is a carriage return (or so it appears).
I hope that isn't confusing
Here's the code for the 2 different boards, so maybe one of you fine folks can determine where I'm going astray.
Of course, the following code is clipped for irrelevant content.
Thanks for taking a peek at the code, and for the help.
Chris
*As you will see, I even tried to enable the serial transmit only when it is needed. That got me to the point
of the 887 board responding back to the PC. Previous to that, neither boards would respond.
1936 code:
887 code:Code:'***********************************SERIAL INTERRUPT************************************** RS232in: @ INT_DISABLE IOC_INT @ INT_DISABLE TMR1_INT @ INT_DISABLE RX_INT low RxLED 'Rx LED ON HSERIN 300,Stall,[DEC3 SerialIn] If SerialIn = 255 then gosub GoodQualifier Stall: while PIR1.5 SerialIn = RCREG wend high RxLED 'Rx LED OFF @ INT_ENABLE IOC_INT @ INT_ENABLE TMR1_INT @ INT_ENABLE RX_INT @ INT_RETURN '***************************************************************************************** GoodQualifier: T1CON = timeroff 'Timer Off hserin 300,Junk,[str SerBuff\10\"~"] 'Parse ASCII CmdPrefix CmdPrefix = SerBuff[0] 'Convert Address from ASCII to DECIMAL for x = 1 to 3 SerBuff[x] = (SerBuff[x]-"0") next 'Build the DECIMAL address CmdAddress = SerBuff[1] * 100 CmdAddress = CmdAddress + SerBuff[2] * 10 CmdAddress = CmdAddress + SerBuff[3] if CmdPrefix = "A" then '-------------------------Address Module---------------------------- Address = CmdAddress write 0,Address LOW TxLED TXSTA = 36 HSEROUT [CmdPrefix,DEC3 Address,13] WHILE PIR1.4 = 0 : WEND TXSTA = 4 HIGH TxLED read 0,Address '------------------------------------------------------------------ endif '--------------------Address Mismatch-------------------------- if CmdAddress = Address then TXSTA = 36 'Turn ON transmitter '-------------------------Command Module---------------------------- if CmdPrefix = "O" then 'Oaaaoo (6) 'Convert CmdOutput from ASCII to DECIMAL for x = 4 to 5 SerBuff[x] = (SerBuff[x]-"0") next 'Build the DECIMAL address CmdOutput = SerBuff[4] * 10 CmdOutput = CmdOutput + SerBuff[5] select case CmdOutput case 10 OUT1 = 0 case 20 OUT2 = 0 case 30 OUT3 = 0 case 11 OUT1 = 1 case 21 OUT2 = 1 case 31 OUT3 = 1 CASE ELSE goto Junk END SELECT HSEROUT [CmdPrefix,DEC3 Address,dec2 CmdOutput,13] endif if CmdPrefix = "Q" then 'Qaaa (4) low TxLED 'Tx LED ON HSEROUT [CmdPrefix,DEC3 Address, _ ",",DEC VOLTS,",",DEC TempF,",",DEC Amps, _ ",",dec PORTA.1,",",DEC PORTA.0,",",DEC PORTA.4,13] high TxLED 'Tx LED OFF endif if CmdPrefix = "P" then 'Paaa (4) low TxLED 'Tx LED ON HSEROUT [CmdPrefix,DEC3 Address,DEC1 ModType,13] high TxLED 'Tx LED OFF endif if CmdPrefix = "M" then 'Maaallvvv (9) '10=LowVolts, 11=HighVolts, 12=LowTemp, 13=HighTemp, 14=LowCurrent, 15=HighCurrent 'M001 Board Address ' 10 EEProm Location (Low Trip) ' 255 Low Trip Value 'Convert eepromloc from ASCII to DECIMAL Maaaeevvv for x = 4 to 5 SerBuff[x] = (SerBuff[x]-"0") next 'Build the DECIMAL eepromloc = SerBuff[4] * 10 eepromloc = eepromloc + SerBuff[5] if (eepromloc < 10) OR (eepromloc > 15) then goto Junk endif 'Convert tripval from ASCII to DECIMAL for x = 6 to 8 SerBuff[x] = (SerBuff[x]-"0") next 'Build the DECIMAL tripval = SerBuff[6] * 100 tripval = tripval + SerBuff[7] * 10 tripval = tripval + SerBuff[8] write eepromloc,tripval HSEROUT [CmdPrefix,DEC3 Address,dec2 eepromloc,dec3 tripval,13] ReReadVals = 1 endif if CmdPrefix = "C" then '(CONTROL) 'Caaa1 ManualControl = (SerBuff[4]-"0") HSEROUT [CmdPrefix,DEC3 Address,dec1 ManualControl,13] endif WHILE PIR1.4 = 0 : WEND 'If we're still transmitting, wait here TXSTA = 4 'Turn OFF transmitter endif '-------------------------------------------------------------- Junk: for x = 0 to 9 SerBuff[x] = " " next T1CON = timeron 'Timer ON return
Code:'*********************************SERIAL INPUT********************************** RS232in: @ INT_DISABLE RX_INT @ INT_DISABLE TMR1_INT HSERIN 300,Stall, [DEC3 SerialIn] If SerialIn = 255 then gosub GoodQualifier Stall: while PIR1.5 SerialIn = RCREG wend @ INT_ENABLE TMR1_INT @ INT_ENABLE RX_INT @ INT_RETURN '******************************************************************************* GoodQualifier: T1CON = timeroff hserin 300,Junk,[str SerBuff\10\"~"] 'Parse ASCII CmdPrefix CmdPrefix = SerBuff[0] 'Convert Address from ASCII to DECIMAL for x = 1 to 3 SerBuff[x] = (SerBuff[x]-"0") next 'Build the DECIMAL address CmdAddress = SerBuff[1] * 100 CmdAddress = CmdAddress + SerBuff[2] * 10 CmdAddress = CmdAddress + SerBuff[3] '-------------------------Address Module---------------------------- 'Aaaa (4) IF CmdPrefix = "A" THEN Address = CmdAddress write 0,Address TXSTA = 36 HSEROUT [CmdPrefix,DEC3 Address,13] WHILE PIR1.4 = 0 : WEND TXSTA = 4 read 0,Address newaddr = 1 endif '------------------------------------------------------------------ '--------------------Address Mismatch-------------------------- if CmdAddress = Address then TXSTA = 36 'Turn ON transmitter '-------------------------Command Module---------------------------- 'Qaaa (4) IF CmdPrefix = "Q" THEN HSEROUT [CmdPrefix,DEC3 Address, _ DEC PORTA.4,DEC PORTA.3,DEC PORTA.5,DEC PORTA.2,_ DEC PORTE.0,DEC PORTA.1,DEC PORTC.1,DEC PORTC.0,_ DEC PORTC.2,DEC PORTE.2,DEC PORTC.3,DEC PORTE.1,_ DEC PORTD.2,DEC PORTD.1,DEC PORTD.3,DEC PORTD.0,_ DEC PORTC.4,DEC PORTC.5,DEC PORTD.7,DEC PORTD.6,_ DEC PORTB.0,DEC PORTD.5,DEC PORTB.1,DEC PORTD.4,13] endif 'Paaa (4) if CmdPrefix = "P" then '(PING) '$BxxxQ HSEROUT [CmdPrefix,DEC3 Address,DEC1 ModType,13] endif 'Oaaarrs (7) IF CmdPrefix = "O" THEN 'Convert Relay from ASCII to DECIMAL Oaaaoo for x = 4 to 5 SerBuff[x] = (SerBuff[x]-"0") next 'Build the DECIMAL address Relay = SerBuff[4] * 10 Relay = Relay + SerBuff[5] Stat = (SerBuff[6]-"0") if Relay = 1 then if stat = 0 then OUT1 = 0 else OUT1 = 1 endif endif if Relay = 2 then if stat = 0 then OUT2 = 0 else OUT2 = 1 endif endif if Relay = 3 then if stat = 0 then OUT3 = 0 else OUT3 = 1 endif endif if Relay = 4 then if stat = 0 then OUT4 = 0 else OUT4 = 1 endif endif if Relay = 5 then if stat = 0 then OUT5 = 0 else OUT5 = 1 endif endif if Relay = 6 then if stat = 0 then OUT6 = 0 else OUT6 = 1 endif endif if Relay = 7 then if stat = 0 then OUT7 = 0 else OUT7 = 1 endif endif if Relay = 8 then if stat = 0 then OUT8 = 0 else OUT8 = 1 endif endif if Relay = 9 then if stat = 0 then OUT9 = 0 else OUT9 = 1 endif endif if Relay = 10 then if stat = 0 then OUT10 = 0 else OUT10 = 1 endif endif if Relay = 11 then if stat = 0 then OUT11 = 0 else OUT11 = 1 endif endif if Relay = 12 then if stat = 0 then OUT12 = 0 else OUT12 = 1 endif endif if Relay = 13 then if stat = 0 then OUT13 = 0 else OUT13 = 1 endif endif if Relay = 14 then if stat = 0 then OUT14 = 0 else OUT14 = 1 endif endif if Relay = 15 then if stat = 0 then OUT15 = 0 else OUT15 = 1 endif endif if Relay = 16 then if stat = 0 then OUT16 = 0 else OUT16 = 1 endif endif if Relay = 17 then if stat = 0 then OUT17 = 0 else OUT17 = 1 endif endif if Relay = 18 then if stat = 0 then OUT18 = 0 else OUT18 = 1 endif endif if Relay = 19 then if stat = 0 then OUT19 = 0 else OUT19 = 1 endif endif if Relay = 20 then if stat = 0 then OUT20 = 0 else OUT20 = 1 endif endif if Relay = 21 then if stat = 0 then OUT21 = 0 else OUT21 = 1 endif endif if Relay = 22 then if stat = 0 then OUT22 = 0 else OUT22 = 1 endif endif if Relay = 23 then if stat = 0 then OUT23 = 0 else OUT23 = 1 endif endif if Relay = 24 then if stat = 0 then OUT24 = 0 else OUT24 = 1 endif endif HSEROUT [CmdPrefix,DEC3 Address,dec2 Relay,dec Stat,13] endif WHILE PIR1.4 = 0 : WEND 'If we're still transmitting, wait here TXSTA = 4 'Turn OFF transmitter endif '-------------------------------------------------------------- Junk: for x = 0 to 9 serbuff[x] = " " next T1CON = timeron return
If so, it sure sounds like a board rework is in order huh. bummer.
I wonder why the 887 board works with both boards on the bus though? That's the part that stumps me. Do you have any insight on that? Just seems that both of them would crash, not just one...
Oh well, ya gotta crack a few eggs to make an omelet right... I'll check back with progress when I get the new boards whipped up.
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