Product

SIEMENS PC-TTY | DB9F to DB15M RS-232/TTY S5 PLC Programming Cable — 3M (6ES5734-1BD20 Compatible)

The Siemens PC-TTY is an RS-232 to TTY (Current Loop) programming cable for Siemens SIMATIC S5 Series PLCs. It connects a PC's RS-232 COM port (DB9 Female) to the S5 PLC programming interface (DB15 Male). Compatible with the Siemens original part number 6ES5734-1BD20.

2️⃣ Key Features

• DB9 Female (9-pin D-Sub) on PC side — connects to PC native RS-232 COM port
• DB15 Male (15-pin D-Sub) on PLC side — connects to S5 PLC TTY programming port
• RS-232 to TTY signal conversion — required for S5 series communication
• 3-metre cable
• 28 AWG copper wire, 7-core construction

3️⃣ Technical Specifications

4️⃣ Compatible Devices / Models

• Siemens SIMATIC S5 Series PLCs (S5-90U, S5-95U, S5-100U, S5-115U, S5-135U, S5-155U) with TTY programming port

⚠️ Always verify the exact port type and model number on your device before ordering.

5️⃣ Typical Use Cases

• PC-to-S5 PLC programming using STEP5 software (Windows DOS/XP/2000 only)
• Legacy S5 PLC maintenance and program backup/restore

6️⃣ Package Contents

• 1× Siemens PC-TTY Programming Cable (6ES5734-1BD20 compatible), DB9F to DB15M, 3M (OEM Compatible — New)

7️⃣ Warranty

• 90-day replacement warranty
• Covers manufacturing defects; physical damage and improper installation not included

8️⃣ Additional Notes

• ⚠️ CRITICAL: This cable requires a NATIVE RS-232 COM port on the PC. It does NOT work with USB-to-RS232 adapters when used with original Step5 software.
• ⚠️ OS LIMITATION: Only compatible with Windows DOS, XP, and 2000. Not supported on Windows 7, 8, or 10.
• OEM compatible — not a Siemens-branded unit.
• Confirmed connector spec: DB9 Female (PC side) to DB15 Male (PLC side) — matching original Siemens 6ES5734-1BD20 specification.