20 mA current loop (option)
Pin no. | Signal name | I/O | Function | |
direction | ||||
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9 | TTY TXDR | — | Indicates the ground side of the data | |
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| signal of 20 mA loop current. | |
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10 | TTY TXD | OUT | Transmitted data of 20 mA current | |
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| loop. | |
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17 | TTY TXDR | — | Indicates the ground side of the data | |
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| signal of 20 mA loop current. | |
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18 | TTY RXDR | — | Indicates the ground side of the data | |
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| signal of 20 mA loop current. | |
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19 | TTY RXD | IN | Received data of 20 mA current loop. | |
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23 | TTY RXDR | — | Indicates the ground side of the data | |
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| signal at 20mA loop current. | |
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24 | TTY TXD | OUT | Transmission data of 20 mA current | |
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| loop. | |
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25 | TTY RXD | IN | Reception data of 20 mA current loop. | |
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RS-422A (option)
| Pin no. | Signal name | I/O | Function | |
APPENDIX | direction | ||||
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9 | SD (+) | OUT | Transmitted data | ||
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| 10 | SD | OUT | Transmitted data | |
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| 17 | RD (+) | IN | Received data | |
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| 18 | RD | IN | Received data | |
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| 19 | CS (+) | IN | When the host computer is set to standby | |
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| for data transmission, this signal | |
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| changes to “SPACE”. | |
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| (In this instance, the printer does not | |
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| check the signal.) | |
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| 23 | CS | IN | When the host computer is set to standby | |
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| for data transmission, this signal | |
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| changes to “SPACE”. | |
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| (In this instance, the printer does not | |
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| check the signal.) | |
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| 24 | RS (+) | OUT | Data transmission request signal. When | |
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| the printer is ready to receive data, this | |
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| signal changes to “SPACE”. | |
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| 25 | RS | OUT | Data transmission request signal. When | |
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| the printer is ready to receive data, this | |
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| signal changes to “SPACE”. | |
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– 50 –
