sim_scan hardware - GSM-Forum

tester_v · 06-08-2003, 23:43

I saw people having problems building(using) simscan hardware. I built it yesterday and first it didn't work until i powered the board from an external power supply (actually I hate com powered stuff, and found that normal) Then i decided to optimize schematics and remove the whole bunch of no longer needed transistors but the thing didn't work anymore. I got a lot of "Card don't send Answer To Reset" and "Bad data in Answer To Reset" messages. Finally I found it was a timing problem and you can't make it work without the 470uF capacitor at DTR & RTS lines, discharged exactly by a 10 kOhm resistor. Everything else works just fine. I tried some other ICs like 74HC14 (one from TI worked, and one from Philips didn't work).
Also make sure the oscillator is working at the right frequency. I used 6.1440 MHz. Hope this help someone. Good luck! :-)

besi_al · 06-09-2003, 00:29

Please Tester_v can you give me the schematics?

wssiow · 06-09-2003, 02:04

yes, u r right. i also power up with external battery.

but how about the dejan's programmer that write the PIC? have u build it? i fail to run it.

tq

Alf · 06-09-2003, 19:20

Perhaps I should stick a simple phoenix (for KI extraction and external eeprom programming) and a JDM (for programming PIC) schematics...

tyuyung · 06-09-2003, 22:12

images and schematics:

http://www.simprog.narod.ru/

Alf · 06-09-2003, 22:21

Thanks for saving me trouble

wssiow · 06-10-2003, 01:51

@ all

is there any replacement for IC MAX232? i can't buy it in my country.

i find very hard to get the schematic that no need to use "MAX232" IC.

tq...

yuge · 07-18-2003, 01:31

here ,,,,http://carddiy.welcometextiles.com/S...nix%20sch2.gif

it is a phoenxi schematic no MAX232 in it, it work correctly.

wssiow · 07-18-2003, 03:25

still have someone study old message ya...

tq very much...

06-08-2003, 23:43	#1 (permalink)
tester_v Junior Member Join Date: Jun 2003 Posts: 2 Member: 30917 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	sim_scan hardware I saw people having problems building(using) simscan hardware. I built it yesterday and first it didn't work until i powered the board from an external power supply (actually I hate com powered stuff, and found that normal) Then i decided to optimize schematics and remove the whole bunch of no longer needed transistors but the thing didn't work anymore. I got a lot of "Card don't send Answer To Reset" and "Bad data in Answer To Reset" messages. Finally I found it was a timing problem and you can't make it work without the 470uF capacitor at DTR & RTS lines, discharged exactly by a 10 kOhm resistor. Everything else works just fine. I tried some other ICs like 74HC14 (one from TI worked, and one from Philips didn't work). Also make sure the oscillator is working at the right frequency. I used 6.1440 MHz. Hope this help someone. Good luck! :-)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
thread	Thread Starter	Forum	Replies	Last Post
Sim_scan ok...	tax555	Sim Cloning and Scaning	6	03-26-2002 22:01
Sim_scan 1.21 problems	tax555	Sim Cloning and Scaning	2	03-12-2002 20:34
sim_scan and JDM programmer?	ginomi	Sim Cloning and Scaning	6	03-12-2002 06:29
Sim_Scan	tropicalstorm	Sim Cloning and Scaning	2	03-08-2002 08:06
I need sim_scan 1.21	Anatoly	Hardware Equipments for GSM	2	01-18-2002 13:14

06-09-2003, 00:29	#2 (permalink)
besi_al Insane Poster Join Date: May 2003 Location: ALBANIA Age: 27 Posts: 83 Member: 29348 Status: Offline Thanks: 1 Thanked 0 Times in 0 Posts	Please Tester_v can you give me the schematics?

06-09-2003, 02:04	#3 (permalink)
wssiow Major Poster Join Date: May 2003 Posts: 44 Member: 29785 Status: Offline Thanks: 0 Thanked 6 Times in 2 Posts	yes, u r right. i also power up with external battery. but how about the dejan's programmer that write the PIC? have u build it? i fail to run it. tq

06-09-2003, 19:20	#4 (permalink)
Alf No Life Poster Join Date: Sep 2001 Location: Portugal Age: 38 Posts: 693 Member: 6156 Status: Offline Thanks: 1 Thanked 3 Times in 3 Posts	Perhaps I should stick a simple phoenix (for KI extraction and external eeprom programming) and a JDM (for programming PIC) schematics...

06-09-2003, 22:12	#5 (permalink)
tyuyung Junior Member Join Date: Apr 2003 Age: 41 Posts: 15 Member: 26729 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	images and schematics: http://www.simprog.narod.ru/

06-09-2003, 22:21	#6 (permalink)
Alf No Life Poster Join Date: Sep 2001 Location: Portugal Age: 38 Posts: 693 Member: 6156 Status: Offline Thanks: 1 Thanked 3 Times in 3 Posts	Thanks for saving me trouble

06-10-2003, 01:51	#7 (permalink)
wssiow Major Poster Join Date: May 2003 Posts: 44 Member: 29785 Status: Offline Thanks: 0 Thanked 6 Times in 2 Posts	@ all is there any replacement for IC MAX232? i can't buy it in my country. i find very hard to get the schematic that no need to use "MAX232" IC. tq...

07-18-2003, 01:31	#8 (permalink)
yuge Junior Member Join Date: Apr 2003 Age: 37 Posts: 10 Member: 26322 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	here ,,,,http://carddiy.welcometextiles.com/S...nix%20sch2.gif it is a phoenxi schematic no MAX232 in it, it work correctly.

07-18-2003, 03:25	#9 (permalink)
wssiow Major Poster Join Date: May 2003 Posts: 44 Member: 29785 Status: Offline Thanks: 0 Thanked 6 Times in 2 Posts	still have someone study old message ya... tq very much...