RS232 : pilot a relay command
I should pilot a relay with RS232 port. If i use the RTS or DTR signals, can i command my relay without damage for my pc
Hi,
I am not sure that I understand your question. Are you going to try to power a relay with a serail port? I wouldn't do this at all. The serial port can't supply enough current to keep the gate closed. You run the risk of blowing up your serial port. I would create a circuit to buffer the output (or better yet, go with a digital card of some sort). You might be able to use some sort of optical isolation circuit to accept the 5 volt input and output the correct voltage/current to power a relay.
Best Regards,
Aaron K.
Application Engineer
National Instruments
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_charges = value;
RaisePropertyChanged(ChargesListPropertyName);
public RelayCommand ShowFaresCommand
get;
set;
/// <summary>
/// Initializes a new instance of the MainViewModel class.
/// </summary>
public MainViewModel()
if (IsInDesignMode)
// Code runs in Blend --> create design time data.
// BonusChargesValue bnc = new BonusChargesValue();
_charges = new ObservableCollection<BonusChargesValue>();
_charges.Add(new BonusChargesValue { AmountToRecharge = 10.0, BonusAmount = 5, NewBalance = 15, NumberofRides = 5 });
_charges.Add(new BonusChargesValue { AmountToRecharge = 12.0, BonusAmount = 6, NewBalance = 17, NumberofRides = 6 });
_charges.Add(new BonusChargesValue { AmountToRecharge = 14.0, BonusAmount = 7, NewBalance = 19, NumberofRides = 7 });
_charges.Add(new BonusChargesValue { AmountToRecharge = 16.0, BonusAmount = 8, NewBalance = 21, NumberofRides = 8 });
_charges.Add(new BonusChargesValue { AmountToRecharge = 18.0, BonusAmount = 9, NewBalance = 23, NumberofRides = 9 });
_charges.Add(new BonusChargesValue { AmountToRecharge = 10.0, BonusAmount = 5, NewBalance = 15, NumberofRides = 5 });
_charges.Add(new BonusChargesValue { AmountToRecharge = 12.0, BonusAmount = 6, NewBalance = 17, NumberofRides = 6 });
_charges.Add(new BonusChargesValue { AmountToRecharge = 14.0, BonusAmount = 7, NewBalance = 19, NumberofRides = 7 });
_charges.Add(new BonusChargesValue { AmountToRecharge = 16.0, BonusAmount = 8, NewBalance = 21, NumberofRides = 8 });
_charges.Add(new BonusChargesValue { AmountToRecharge = 18.0, BonusAmount = 9, NewBalance = 23, NumberofRides = 9 });
else
// Code runs "for real"
Charges = new ObservableCollection<BonusChargesValue>();
ShowFaresCommand = new RelayCommand(GetValues, () => { return true; });
// ShowFares = new RelayCommand(() =>
// Words = new string(Words.ToCharArray().Reverse().ToArray());
//_charges = new ObservableCollection<BonusChargesValue>();
//_charges.Add(new BonusChargesValue { AmountToRecharge = 10.0, BonusAmount = 5, NewBalance = 15, NumberofRides = 5 });
//_charges.Add(new BonusChargesValue { AmountToRecharge = 12.0, BonusAmount = 6, NewBalance = 17, NumberofRides = 6 });
//_charges.Add(new BonusChargesValue { AmountToRecharge = 14.0, BonusAmount = 7, NewBalance = 19, NumberofRides = 7 });
//_charges.Add(new BonusChargesValue { AmountToRecharge = 16.0, BonusAmount = 8, NewBalance = 21, NumberofRides = 8 });
//_charges.Add(new BonusChargesValue { AmountToRecharge = 18.0, BonusAmount = 9, NewBalance = 23, NumberofRides = 9 });
//_charges.Add(new BonusChargesValue { AmountToRecharge = 10.0, BonusAmount = 5, NewBalance = 15, NumberofRides = 5 });
//_charges.Add(new BonusChargesValue { AmountToRecharge = 12.0, BonusAmount = 6, NewBalance = 17, NumberofRides = 6 });
//_charges.Add(new BonusChargesValue { AmountToRecharge = 14.0, BonusAmount = 7, NewBalance = 19, NumberofRides = 7 });
//_charges.Add(new BonusChargesValue { AmountToRecharge = 16.0, BonusAmount = 8, NewBalance = 21, NumberofRides = 8 });
//_charges.Add(new BonusChargesValue { AmountToRecharge = 18.0, BonusAmount = 9, NewBalance = 23, NumberofRides = 9 });
private void GetValues()
CalculateMetroFare cmcf = new CalculateMetroFare();
if (!string.IsNullOrWhiteSpace(CurrentBalance))
var chr = cmcf.Add2ExistingCard(Convert.ToInt32(CurrentBalance));
foreach (BonusChargesValue bncv in chr)
Charges.Add(bncv);
}`enter code here`
// return _charges;
VAravind ---------------------------------------------------------------------------------------------------------------------------------- Please click "Propose As Answer" if a post solves your problem or "Vote As Helpful" if a post
has been useful to you. Blog
VAravind ---------------------------------------------------------------------------------------------------------------------------------- Please click "Propose As Answer" if a post solves your problem or "Vote As Helpful" if a post
has been useful to you. BlogI am not getting error but the Listview is not getting updated after the relay command
VAravind ---------------------------------------------------------------------------------------------------------------------------------- Please click "Propose As Answer" if a post solves your problem or "Vote As Helpful" if a post
has been useful to you. Blog -
Variable local buffer ecriture
Bonjour,
Mon probleme ce situe au niveau de l'utilisation des variables locales !
je vous poste un Vi simplifié de mon projet afin de mieux comprendre le probleme!
en effet je crée des variables locales (des buffers d'ecritures des instruments que je veut commander afin d'envoyé des commandes plus loin dans le diagramme, en voulant qu'à chaque fois q'une commande est mis dans la variable locales "Ecrire IHM" par ex, le Vi ecrive sur le buffer et lise la reponse !
pour cela j'ai testé avec une boucle while (sans conviction et sans résultat)
Merci ! Cordialement !
Ps : j'utilise Labview 2009 mais enregister pour Labview 8.6
Pièces jointes :
pour forum pb variable local buffer ecriture.zip 32 KBBonjour, ramses64
Comme tu a pu le remarquer je suis débutant et voici mon problème, je suis en stage de fin d'étude et je dois faire une application sous Labview 2009 où j'inter agie avec un appareil en Bluetooth (clé BT sur pc portable) et avec un appareil de mesure en RS232 via (usb/comm DB9)
Donc voila mon problème je dois tantôt envoyer des commandes particulières à l'appareil BT et recevoir un acquittement tantôt envoyer des commandes particulières via RS 232 et recevoir un acquittement. Mes commandes fonctionnent bien en direct Q/R.
je ne sait pas comment m'y prendre pour séquencer les commandes sur les 2 ports com . (une centaines de commandes pour chaque appareil ! couper en plusieur fonction Init ; Check ; Test ; Etc) . Mon post précedent etait juste une idée !
En effet mon probleme et un probleme de compréhension de Labview :-/ ( 1 er prog et seul ) , j'ai pensé que les variables locales me renvoyées les données à mon buffer d'ecriture de base (afin de refaire la sequence 1 (comme un sous programme) ! Or ce n'est apparement pas le cas . Je reposte MON VI plus complet afin de bien comprendre mon probleme !
N'hésiter pas je suis ouvert à toute remarques sur ce que j’ai fait de maladroit ou de faux et aux idées de développements etc..
Merci
par ex : BT comm 5 et RS232 comm 6
ex Commandes a envoyé :
=>BAT+CG=6 (comm 5)
<=Timeout 20Sec pour réponse CT+CG=2 (comm 5)
=>CL :LU (comm 6)
=> BAT+CP= ? (comm 5)
<= Timeout 20Sec pour réponse (comm 5)
=>CL :MSN :RL ? comm 6<=-28 ;23 ;98 comm 6
Pièces jointes :
forum_buffer variable locale.vi 1069 KB -
Problem reading PXI-2503 channels above 23 in 1-Wire 48x1 Mux mode in Linux
I'm having trouble getting relay positions above 23 in the 1-wire 48x1 mode
% nilsdev | grep 2503
NI PXI-2503: "Dev1"
The topology is set to "2503/1-Wire 48x1 Mux" via the following API, using device "Dev1"
DAQmxSwitchSetTopologyAndReset(device,topology)
In theory that means there are 48 inidividual relays than can be read, however, the following fails:
switchname = "/Dev1/ch47"
DAQmxSwitchGetSingleRelayPos(switchName, &pos)
The error returned is:
DAQmx Error: Relay name is invalid.
Relay Name: ch47
Status Code: -200202
which is
#define DAQmxErrorInvalidRelayName (-200202)
I am unable to get the relay position for anything above relay 23 ( /Dev1/ch23 )
Is that the expected behaviour, or is there a driver or hardware issue ?
Solved!
Go to Solution.When using this switch in "1-wire" mode, we are essentially breaking each (+)/(-) pair into their own channels. Since this topology utilizes double pole, single throw switches whose individual terminals cannot be switched independently, another switch is introduced to decide which side of the switch is being accessed as what point in time, (+) or (-).
Instead of having 48 single pole single throw, we can have 24 double pole single throw and one single pole double throw to decide which polarity we're referencing. You can still utilize this topology in a 48x1 1-wire mode.
To manually switch using DAQmx relay commands, you will have to specify the channel switch and the polarity switch as Maggie mentioned. When you call "DAQmxSwitchConnect /Dev1/ch47 /Dev1/com0", the driver knows to close the ch 24 relay in addition to "HLSELECT" AND "1WIRE" to route only the positive terminal (effectively ch.47).
The NI Switches Help document contains a more detailed explanation of the topology if you navigate to Devices >> NI PXI-2501/2503 >>
1-Wire 48×1 Multiplexer Topology.
National Instruments -
Hex display in LabVIEW TestStand equivalent
Hi, I am trying to communicate to a device using RS232 communications.
The command i need to send in hex is 5054 4958 2001 200A 0D
This cannot be represented by ASCII characters, i.e. it appears as PTIX .
I can achieve this no problem in LabVIEW by setting the string control to 'Hex Display' but when I try to load the hex string via TestStand it becomes 3530 3534 3439 3538 3230 3031 3230 3041 3044 which is the hex display of 5054 4958 2001 200A 0D.
Is there anyway that I can export the hex command into the LABVIEW VI? I tried important the decimal number equivalent and then using convert number to hexadcimal string but this doesn't work as the hexadeciaml string is
505449582001200A0D
but the actual string should be PTIX
I have attached my code and any suggestion would be welcome.
Rgds,
Sean
Attachments:
Sean RS232 Commv2.vi 33 KBNot sure why you would try Number to Hex String. What I've done in the past is use a numeric array and the Byte Array to String or a numeric and the Typecast function. Both of these functions have been discussed endlessly in posts about sending hex with a VISA Write.
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