Can someone explain what the sense line does? I have sucessfully loaded radios using only the data line but in what circumstances do I need the sense? What is it sensing and what is expecting to sense?
thanks
thanks
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KFDTool Omahacomms version question
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WX4JCW
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reads the key ID? or is that how the Moto's know to go into Keyload mode? - im kinda just stabbing
prcguy
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The moto cable for the APX has a Dallas DS2433 if I recall the number correctly, eprom that tells the radio via the 1wire line what type of cable is present. There isn't a resistor to initiate keyload mode like the Harris. Or that's how it appears.
I haven't been able to read anything but presence and disconnect packets yet when sniffing the line in the keyload cable but I did see that the programming cable announces the cable model number and type.
The 1wire device gets its power parasitically from the data line. So, there are only two wires going from the MX connector to the radio end, ground and data.
I'm curious as to when and what radio the sense line is used for.
I haven't been able to read anything but presence and disconnect packets yet when sniffing the line in the keyload cable but I did see that the programming cable announces the cable model number and type.
The 1wire device gets its power parasitically from the data line. So, there are only two wires going from the MX connector to the radio end, ground and data.
I'm curious as to when and what radio the sense line is used for.
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When the OMAP (U6501) detects that an accessory has been attached through a logic low on GPIO0, it will identify the device by reading the GCAI_ONE_WIRE line. Once the device type is identified, the appropriate signals are multiplexed through MAKO to the GCAI connector for the particular device.
The sense line is used by the radio to sense that a keyloader is connected and go into keyload mode. It's always pulled to ground on the keyloader side. Per the P25 standard, this is part of the three wire interface (bidirectional data, sense, and ground). In practice once the radio is in keyload mode, only the data and ground lines are required.
For example on the Motorola APX portable audio/keyload Hirose adapter - the onewire EEPROM is used to tell the radio that a Hirose adapter is connected, and the sense line is used to tell the radio if it will be used for audio or keyloading.
Other vendors use the sense line in different ways, or don't use it at all and require a menu selection to enter keyload mode.
For example on the Motorola APX portable audio/keyload Hirose adapter - the onewire EEPROM is used to tell the radio that a Hirose adapter is connected, and the sense line is used to tell the radio if it will be used for audio or keyloading.
Other vendors use the sense line in different ways, or don't use it at all and require a menu selection to enter keyload mode.
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Ok but the indicator never lights in my device. I have used a Thales T25, Harris XG-100, XTS-5000, and even a keyloader in emulator mode and it never indicates. What do I attach it to? The 1 wire interface only requires the 1 wire line and ground. If it's a ground reference why is it routed to an I/O line?
WX4JCW
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There is a setting for the indicator lights in the software file "hal.h" I get a blue and green one
Oh I get the green power and blue but the sense never indicates. I'll check it out.
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