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Which connector? That scope has GPIB, RS-232, and parallel printer interfaces.
The RS-232 pinout is in the TDS1000 series user manual that you can download from Tektronix web site (after free registration). The manual doesn't give GPIB or printer interface pinouts, but they are common industry standards. You can also download the service manual, but it doesn't have any schematics.
For GPIB info, find a copy of IEEE standards 488.1-1987 and 488.2-1992.
From page 142/143, "RS-232 Connector Pinout Diagram":
1 No connection
2 Receive data (RxD) (input)
3 Transmit data (TxD) (output)
4 Data terminal ready (DTR) (output)
5 Signal ground (GND)
6 Data set ready (DSR) (input)
7 Request to send (RTS) (output)
8 Clear to send (CTS) (input)
9 No connection