13.RS-232C SERIAL INTERFACE
The balance is a Data Communication Equipment (DCE) device. Connect the balance to a personal computer (DTE) using a straight through cable.
Transmission system : | EIA |
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Transmission form | : | Asynchronous, |
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Transmission rate | : | 20 times/second, 10 times/second or 5 times/second (same as data refresh rate) | |||||||||||||||||||||||||||
Data format | : Baud rate |
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| : 600, 1200, 2400, 4800, 9600, 19200 bps |
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| Data bits |
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| : 7 or 8 bits |
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| Parity | : | Even, Odd | (Data bits 7 bits) |
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| None |
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| (Data bits 8 bits) |
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| Stop bit | : | 1 bit |
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| Code |
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| : ASCII |
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| 1 | ||||
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| LSB |
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| MSB |
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| 0 |
| 1 |
| 2 | 3 |
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| 4 | 5 | 6 |
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| 0 | +5V to +15V | |||
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| Data bits |
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| Stop bit |
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| Start bit |
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| Parity bit |
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D-Sub 9-pin assignments
Pin No. | Signal name | Direction | Description |
1 | - | - | No connection |
2 | TXD | Output | Transmit data |
3 | RXD | Input | Receive data |
4 | - | - | No connection |
5 | SG | - | Signal ground |
6 | DSR | Output | Data set ready |
7 | RTS | Input | Request to send |
8 | CTS | Output | Clear to send |
9 | - | - | No connection |
Signal names of the balance side are the same as the DTE side with TXD and RXD reversed.
Balance side |
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| Computer side |
DCE |
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| DTE |
| TXD | 2 | RXD |
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| RXD | 3 | TXD |
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| RTS | 7 | RTS |
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| CTS | 8 | CTS |
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Approx.5V | DSR | 6 | DSR |
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| SG | 5 | SG |
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| Terminals sample |
Inside of balance |
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