SECTION 5: INTERFACE SPECIFICATIONS
5.4.1 RS-232C INTERFACE SIGNALS
Pin | Direction | Signal Definition |
1 | Reference | FG (Frame Ground) |
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2 | To Host | TD (Transmit Data) |
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| characters or status data |
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3 | To Printer | RD (Receive Data) |
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4 | To Host | RTS (Request to Send) |
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| condition. RTS is high and remains high unless the print head is open (in this case, |
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| RTS would return to the high state after the print head is closed and the printer is |
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| placed back |
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| error, label out). |
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5 | To Printer | CTS (Clear to Send) |
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| to be transmitted. The printer will not receive data when this line is low. If this line is |
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| not being used, it should be tied high (to pin 4). |
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6 | To Printer | DSR (Data Set Ready) |
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| data. This line must be high before data is transmitted. If this line is not being used, |
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| it should be tied high (to pin 20). |
7 | Reference | SG (Signal Ground) |
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20 | To Host | DTR (Data Terminal Ready) |
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| printer is ready to receive data when this pin is high. It goes low when the printer is |
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| gle Job Buffer mode. It will also go low when the data in the buffer reaches the Buf- |
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| fer Near Full level. |
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Cable Requirements
DB9 | DB2 | HOST INTERCONNECTION |
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1 | 1 | FG |
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| 1 | FG (Frame Ground) | |
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2 | 3 | RD |
| 2 | TD (Transmit Data) | ||
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3 | 2 | TD |
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| 3 | RD (Receive Data) | |
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8 | 5 | CTS |
| 4 | RTS (Request to Send) | ||
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7 | 4 | RTS |
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| 5 | CTS (Clear to Send) | |
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4 | 20 | DTR |
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| 6 | DSR (Data Set Ready) | |
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6 | 6 | DSR* |
| 20 | DTR (Data Terminal Ready) | ||
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5 | 7 | SG |
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| 7 | SG (Signal Ground) | |
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*This connection at the host side of the interface would depend upon the pin that is being used as the Ready/Busy signal by the driving software. Typically, on a PC, it would be either CTS (pin 5) or DSR (pin 6) on a
Page | SATO D508/D512 Operator Manual |