The Robotron CM 6329.02 M is a wide-carriage 9-pin dot-matrix printer manufactured by VEB Robotron-Büromaschinenwerk “Ernst Thälmann” Sömmerda (DDR) circa 1989. It accepts interchangeable interface modules including V.24/RS-232, Centronics, and several others. This cable connects the printer’s proprietary V.24 interface module to the 25-pin or 9-pin COM2 port of an IBM PC/XT/AT using standard ITU-T V.24 circuit assignments. Signal lines are crossed in the conventional DTE–DCE manner: transmit on one side connects to receive on the other, and the handshake lines (RTS/CTS and DTR/DSR) are similarly swapped.
9 pin D-SUB female connector to the computer
| ROBOTRON 6329.02 Pin name | ROBOTRON 6329.02 Pin | Direction | IBM PC/XT/AT COM2 (RS232/423,V24) Pin 25-pin (9-pin) | IBM PC/XT/AT COM2 (RS232/423,V24) Pin name | Description |
|---|---|---|---|---|---|
| SG /102 | A1 | - | 7 (5) | SG /102 | |
| TxD /103 | A3 | OUT | 3 (2) | RxD /104 | |
| RxD /104 | B4 | IN | 2 (3) | TxD /103 | |
| RTS /105 | A5 | OUT | 5 (8) | CTS /106 | |
| CTS /106 | B6 | IN | 4 (7) | RTS /105 | |
| DSR /107 | A7 | IN | 20 (4) | DTR /108.2 | |
| DTR /108.2 | B8 | OUT | 6 (6) | DSR /107 | |
| GND /101 | B2 | - | 8 (1) | GND /101 |
Signals
- SG /102 — Signal ground / common return (V.24 circuit 102); connects both sides of the cable.
- TxD /103 — Transmitted data; data sent from the DTE (PC) to the DCE; crossed to RxD on the printer side.
- RxD /104 — Received data; data arriving at the DTE from the DCE; crossed to TxD on the printer side.
- RTS /105 — Request to send; output from the DTE, crossed to CTS at the printer end.
- CTS /106 — Clear to send; input to the DTE, sourced from RTS at the printer end.
- DSR /107 — Data set ready; input to the DTE indicating the printer interface is ready; crossed to DTR.
- DTR /108.2 — Data terminal ready; output from the DTE asserting readiness; crossed to DSR at the printer.
- GND /101 — Protective ground; chassis earth connection.
Notes
The Robotron CM 6329.02 M printer connector uses a proprietary row-letter/number designation (A1, A3, B4, etc.); no public datasheet for this connector has been issued by the manufacturer. Signal names follow ITU-T V.24 circuit numbering. Electrical levels conform to V.28 (±3–15 V RS-232). The 25-pin and 9-pin IBM COM2 pin numbers are both listed in the table (25-pin first, 9-pin in parentheses).