TM
Serial Interface
9 pin Female
Pin | Signal Name | I/O | Function | |
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1 | DCD | O | Data carrier detect | |
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2 | TXD | O | Transmit data | |
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3 | RXD | I | Receive data | |
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4 | N.C. |
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5 | GND |
| Ground | |
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6 | RTS | O | Request to send. This is always “SPACE” when the | |
printer is turned on. | ||||
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7 | N.C. |
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8 | DTR | O | Data terminal ready. This signal changes to | |
PACE” when the printer is ready to receive data. | ||||
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9 | N.C. |
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CHAP. 5 MAIN …
Peripheral Unit Drive
6 pin telephone jack
Pin | Signal Name | I/O | Function |
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1 | Chassis GND |
| To connect the shield of cable between printer and |
| the peripheral device | ||
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| Supplies a low trigger pulse to drive the circuitry L1 |
2 | L1 Drive | O | with a diode protection. This shall not be driven |
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| together with L2 at the time. |
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| To connect through diode and resistor to +24VDC |
3 | SW Sense | I | to detect the status of cash drawer open detection |
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| switch. |
4 | +24 V DC | O | Connected to +24VDC supplied by the printer. |
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| Supplies a low trigger pulse to drive the circuitry L1 |
5 | L2 Drive | O | with a diode protection. This shall not be driven |
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| together with L2 at the time. |
6 | GND | O |
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