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| Interface RS485 half duplex |
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Brief description |
RS485-Interface to connect to a pc.
There is a maximum cable lenght of 1,2 km and a maximum number of 30 participants per segment.
In cause of the automatical Send/Receive switching, the module must be ordered for a certain Baudrate.
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RS485 half duplex
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| TTL/CMOS pin assignment (left) |
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| Pin |
Name |
| 1 |
- |
NA |
| 2 |
- |
NA |
| 3 |
TxD |
Input |
| 4 |
RxD |
Output |
| 5 |
GND |
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| 6 |
VCC |
+ 5V |
| 7 |
- |
NC |
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| RS485 pin assignment (right) |
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| Pin |
Name |
| 1 |
GND |
| 2 |
NC |
| 3 |
A + |
| 4 |
B - |
| 5 |
NC |
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| NC = |
not connected |
= |
nicht angeschlossen |
| NA = |
not available |
= |
nicht vorhanden |
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Recommended operating conditions and electrical characteristics
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| Input Voltage UEIN |
min.
max. |
± 0,2 V
± 15 V |
| Input resistance REIN |
typ. |
12 kΩ |
| Output Voltage UAUS |
typ. |
± 5 V
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| Output Current IAUS |
typ. |
± 60 mA
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| Supply Voltage |
typ. |
5 V |
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