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| Search found 15 matches |
| Author | Message |
|---|---|
 Topic: Convert decimal to hex and then change the msb/lsb |
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| iman_zahari Replies: 8 Views: 16068 |
 Forum: General CCS C Discussion Posted: Sun Oct 10, 2010 7:55 am Subject: Convert decimal to hex and then change the msb/lsb |
| ADC values are neither decimal nor hexadecimal, they are just binary. Decimal or hexadecimal are printable reprentations of the binary value.
Exchanging MSB and LSB of a 16 bit value can be done in ... |
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| Topic: Convert decimal to hex and then change the msb/lsb |
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| iman_zahari Replies: 8 Views: 16068 |
Forum: General CCS C Discussion Posted: Sun Oct 10, 2010 5:31 am Subject: Convert decimal to hex and then change the msb/lsb |
| ADC values are neither decimal nor hexadecimal, they are just binary. Decimal or hexadecimal are printable reprentations of the binary value.
Exchanging MSB and LSB of a 16 bit value can be done in ... |
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| Topic: Convert decimal to hex and then change the msb/lsb |
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| iman_zahari Replies: 8 Views: 16068 |
Forum: General CCS C Discussion Posted: Sun Oct 10, 2010 5:18 am Subject: Convert decimal to hex and then change the msb/lsb |
However there may be no point!.... 
I suspect the actual requirement, is to output the bytes in reverse order in hex, using printf/sprintf. In which case, just send the value as bytes with the or ... |
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| Topic: Convert decimal to hex and then change the msb/lsb |
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| iman_zahari Replies: 8 Views: 16068 |
Forum: General CCS C Discussion Posted: Sun Oct 10, 2010 2:33 am Subject: Convert decimal to hex and then change the msb/lsb |
| Good day all,
I'm using 16f877a for voltage/current measurement. However, to feed it into modbus, I need to convert to hex and then change the position of the msb with lsb. It is a 10 bit adc r ... |
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| Topic: 4n35 optoisolator for DC voltage measuring |
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| iman_zahari Replies: 12 Views: 17474 |
Forum: General CCS C Discussion Posted: Tue Sep 28, 2010 4:28 am Subject: 4n35 optoisolator for DC voltage measuring |
| In a short, the said HCPL-7520 implements an amplifier and ADC on the primary side, a digital optocoupler and a DAC on the secondary, providing a considerably higher performance than analog solutions ... | |
| Topic: 4n35 optoisolator for DC voltage measuring |
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| iman_zahari Replies: 12 Views: 17474 |
Forum: General CCS C Discussion Posted: Tue Sep 28, 2010 4:25 am Subject: 4n35 optoisolator for DC voltage measuring |
| As SherpaDoug and FVM have mentioned, it all depends on your application. I would look at ADI and TI for reference designs as they're very well versed companies in analog design. However, in keeping w ... | |
| Topic: 4n35 optoisolator for DC voltage measuring |
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| iman_zahari Replies: 12 Views: 17474 |
Forum: General CCS C Discussion Posted: Mon Sep 27, 2010 5:59 pm Subject: 4n35 optoisolator for DC voltage measuring |
| Sherpa, I've been there! LOL. My last project involves using HCPL-7520, but in my place it is quite expensive at 11usd per piece. I need to use 8! Thought the 4n35 can replace the 7520.
Btw, what ... |
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| Topic: 4n35 optoisolator for DC voltage measuring |
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| iman_zahari Replies: 12 Views: 17474 |
Forum: General CCS C Discussion Posted: Mon Sep 27, 2010 3:03 pm Subject: 4n35 optoisolator for DC voltage measuring |
| Ttelmah, is there any good suggestion to isolate my input voltage? What is the norm in isolating the input voltage for ADC to the PIC? | |
| Topic: 4n35 optoisolator for DC voltage measuring |
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| iman_zahari Replies: 12 Views: 17474 |
Forum: General CCS C Discussion Posted: Mon Sep 27, 2010 1:56 pm Subject: 4n35 optoisolator for DC voltage measuring |
| I think I've mistakenly put the question there. When I increase the input voltage, the output voltage decreases. Is anything wrong my setting? It should be forward biased and proportional.
Regardi ... |
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| Topic: 4n35 optoisolator for DC voltage measuring |
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| iman_zahari Replies: 12 Views: 17474 |
Forum: General CCS C Discussion Posted: Mon Sep 27, 2010 1:33 pm Subject: 4n35 optoisolator for DC voltage measuring |
| Hi all,
I've encountered a problem. I've tried to set the input current to the opto by using 5V and 600 ohm resistor, resulting less than 10mA input current. On the output side, I have put the volt ... |
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| Topic: Modbus implementation |
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| iman_zahari Replies: 86 Views: 111498 |
Forum: General CCS C Discussion Posted: Sat Jul 24, 2010 2:33 am Subject: Modbus implementation |
| oo ok. i got it all now. tqvm FvM | |
| Topic: Modbus implementation |
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| iman_zahari Replies: 86 Views: 111498 |
Forum: General CCS C Discussion Posted: Fri Jul 23, 2010 1:23 am Subject: Modbus implementation |
| All right. I got it. It is 5. I got confused by the buffer size. But if int8 coils = 0b00000101 is the number of length, then what int8 inputs = 0b00001001 is supposed to mean? | |
| Topic: Modbus implementation |
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| iman_zahari Replies: 86 Views: 111498 |
Forum: General CCS C Discussion Posted: Fri Jul 23, 2010 1:19 am Subject: Modbus implementation |
| The length is the buffer size rite? Sorry but I'm not sure where to locate it. | |
| Topic: Modbus implementation |
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| iman_zahari Replies: 86 Views: 111498 |
Forum: General CCS C Discussion Posted: Wed Jul 21, 2010 12:50 am Subject: Modbus implementation |
| I tried using modbusview. When I tried to force coil 01 to go high, the reply is high,
transmit: [01] [05] [00] [FF] [00] [8C] [3A] receive: [01] [05] [00] [FF] [00] [8C] [3A] So I guess ... |
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| Topic: Modbus implementation |
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| iman_zahari Replies: 86 Views: 111498 |
Forum: General CCS C Discussion Posted: Tue Jul 20, 2010 11:44 pm Subject: Modbus implementation |
| Hey guys, in ex_modbus_slave.c , what does these means?
int8 coils = 0b00000101; int8 inputs = 0b00001001; int16 hold_regs[] = {0x8800,0x7700,0x6600,0x5500,0x4400,0x3300,0x2200,0x1100}; ... |
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