1 |
DENIED
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ROLE_USER
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Show voter details
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2 |
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moderate
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App\Entity\EntryComment {#1365
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+name: "askelectronics@discuss.tchncs.de"
+title: "askelectronics"
+description: """
**For questions about component-level electronic circuits, tools and equipment.**\n
\n
Rules\n
-----\n
\n
1: Be nice.\n
\n
2: Be on-topic (eg: *Electronic*, not *electrical*).\n
\n
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4: Be safe.\n
\n
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date: 2024-09-25 09:01:54.0 +02:00
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date: 2023-06-19 05:13:29.0 +02:00
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+body: """
In addition to the voltages being different between real-RS232 and "TTL"-serial, they're also swapped. On a DB9 you probably have something approximating RS232, where mark=-9V and space=+9V, but the debug header is likely mark=+3V and space=0V. So even if your inputs can handle a wide voltage range, the sense is inverted, which is why you'll get garble.\n
\n
(For example, when the line is idle it's at the 'mark' voltage and the receiver knows a character is incoming when it transitions to 'space' for one period (the start-bit). If mark and space are swapped, the receiver will see 'space' most of the time and only detect a character starting when there are some 'mark' bits in the middle of a transmitted character. It'll never actually synchronize correctly with the transmitter.)\n
\n
You can figure out what you've got with a multimeter and checking what the voltage is on the TX pin when it's idle.
"""
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Show voter details
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3 |
DENIED
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edit
|
App\Entity\EntryComment {#1365
+user: Proxies\__CG__\App\Entity\User {#1378 …}
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**For questions about component-level electronic circuits, tools and equipment.**\n
\n
Rules\n
-----\n
\n
1: Be nice.\n
\n
2: Be on-topic (eg: *Electronic*, not *electrical*).\n
\n
3: No commercial stuff, buying, selling or valuations.\n
\n
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\n
---
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+body: """
In addition to the voltages being different between real-RS232 and "TTL"-serial, they're also swapped. On a DB9 you probably have something approximating RS232, where mark=-9V and space=+9V, but the debug header is likely mark=+3V and space=0V. So even if your inputs can handle a wide voltage range, the sense is inverted, which is why you'll get garble.\n
\n
(For example, when the line is idle it's at the 'mark' voltage and the receiver knows a character is incoming when it transitions to 'space' for one period (the start-bit). If mark and space are swapped, the receiver will see 'space' most of the time and only detect a character starting when there are some 'mark' bits in the middle of a transmitted character. It'll never actually synchronize correctly with the transmitter.)\n
\n
You can figure out what you've got with a multimeter and checking what the voltage is on the TX pin when it's idle.
"""
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date: 2023-06-26 02:09:06.0 +02:00
}
} |
|
Show voter details
|
4 |
DENIED
|
moderate
|
App\Entity\EntryComment {#1365
+user: Proxies\__CG__\App\Entity\User {#1378 …}
+entry: App\Entity\Entry {#1810 …}
+magazine: App\Entity\Magazine {#313
+icon: Proxies\__CG__\App\Entity\Image {#294 …}
+name: "askelectronics@discuss.tchncs.de"
+title: "askelectronics"
+description: """
**For questions about component-level electronic circuits, tools and equipment.**\n
\n
Rules\n
-----\n
\n
1: Be nice.\n
\n
2: Be on-topic (eg: *Electronic*, not *electrical*).\n
\n
3: No commercial stuff, buying, selling or valuations.\n
\n
4: Be safe.\n
\n
---
"""
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+body: """
In addition to the voltages being different between real-RS232 and "TTL"-serial, they're also swapped. On a DB9 you probably have something approximating RS232, where mark=-9V and space=+9V, but the debug header is likely mark=+3V and space=0V. So even if your inputs can handle a wide voltage range, the sense is inverted, which is why you'll get garble.\n
\n
(For example, when the line is idle it's at the 'mark' voltage and the receiver knows a character is incoming when it transitions to 'space' for one period (the start-bit). If mark and space are swapped, the receiver will see 'space' most of the time and only detect a character starting when there are some 'mark' bits in the middle of a transmitted character. It'll never actually synchronize correctly with the transmitter.)\n
\n
You can figure out what you've got with a multimeter and checking what the voltage is on the TX pin when it's idle.
"""
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date: 2023-06-26 02:09:06.0 +02:00
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} |
|
Show voter details
|
5 |
DENIED
|
edit
|
App\Entity\Magazine {#313
+icon: Proxies\__CG__\App\Entity\Image {#294 …}
+name: "askelectronics@discuss.tchncs.de"
+title: "askelectronics"
+description: """
**For questions about component-level electronic circuits, tools and equipment.**\n
\n
Rules\n
-----\n
\n
1: Be nice.\n
\n
2: Be on-topic (eg: *Electronic*, not *electrical*).\n
\n
3: No commercial stuff, buying, selling or valuations.\n
\n
4: Be safe.\n
\n
---
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Show voter details
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