HARDWARE DESCRIPTION
1.I/F board connector: EIA standard
2.For signal description and pin assignment, refer to the table below:
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| signal is at he positiv | ||
Table 9. Signal Description and Pin Assignment |
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| Pin No. |
| Signal name | Direction |
| Description |
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1 |
| protective | — | Chasis | ground |
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| Ground |
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2 |
| Transmitted | Text | Transmitted serial data |
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| Data (TXD) |
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3 |
| Received | Data | Ill | Received | serial data |
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| (RXD) |
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4 |
| Request | to | o u t | This signal is always | at the |
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| Send (RTS) | positive EIA level. |
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7 |
| Signal Ground | In | Return | path for data | and |
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| control | signals. |
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| Reverse |
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| This |
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| EIA Level when the printer is |
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1 1 |
| Channel |
| Out |
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| ready to | accept data | entry |
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| (=2nd RTS) |
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| and at the negative EIA |
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| level when the printer is not |
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20 |
| Data Terminalk t | O u t | ready | to | accept data | entry |
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| Operator | can invert | the |
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| Ready (DIR) |
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| polarity of the signal with |
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| jumper | 15. |
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