Identify the Required Cable
The stated controller is a Unitronics Vision 120, and the programming software is VisiLogic. The available evidence identifies the communication lead as an RS-232 cable connected to the controller through the modular connector described in the source as “R11.” Because the evidence does not confirm the connector designation, pin count, or signal-to-pin mapping, verify the diagram in VisiLogic before selecting an RJ-style plug or terminating conductors.
| Item | Evidence-supported detail | Decision |
|---|---|---|
| Controller | Unitronics Vision 120 | Use the cable diagram associated with this controller in VisiLogic Help. |
| Computer-side interface | RS-232 | Do not substitute another serial interface without supporting documentation. |
| Controller-side connector | Described only as “R11” | Confirm the connector type and pin count from the software diagram. |
| Pin mapping | Not supplied | Do not guess conductor assignments. |
Find the Wiring Diagram in VisiLogic
Open VisiLogic Help and locate the modem cable pinout section. The evidence states that this help topic contains the construction diagram for the RS-232-to-modular cable used with the PLC. Treat that diagram as the controlling reference because the supplied evidence contains no pin numbers, signal names, connector orientation, or crossover details.
Build and Check the Cable
- Open the modem cable pinout in VisiLogic Help and confirm that it applies to the Vision 120.
- Identify both connector orientations before assigning any conductors.
- Terminate the RS-232 and modular ends exactly as shown in the diagram.
- With the cable disconnected from the PLC and computer, check every conductor for continuity and check adjacent conductors for unintended shorts.
Do not infer the wiring from connector shape alone. A modular plug can accept several signal arrangements, and the evidence does not establish which pins carry transmit, receive, or reference signals.
Prepare for the PLC Backup
The cable information resolves only the physical communication requirement. Before initiating the backup, confirm that VisiLogic recognizes the controller through the selected serial connection. The evidence does not provide communication settings, backup commands, or a recovery procedure, so obtain those details from the installed VisiLogic Help rather than entering assumed values.
FAQ
What cable connects VisiLogic to a Unitronics Vision 120?
The evidence identifies an RS-232 cable with a modular connector at the PLC end. Confirm the exact connector and wiring in the modem cable pinout within VisiLogic Help.
Where is the Vision 120 communication cable pinout?
Open VisiLogic Help and locate the modem cable pinout section. It contains the construction diagram referenced for this connection.
Can I wire the Vision 120 cable without the VisiLogic diagram?
No reliable pin assignment is present in the evidence. Verify connector orientation and every signal-to-pin connection from VisiLogic Help, then test continuity and shorts before connecting the cable.