Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | GE / Abaco Systems |
| Model | PMC422-LAM D2 |
| Product Type | PMC Serial Controller Module |
| PMC Standard | PCI Mezzanine Card (PMC) |
| Serial Channels | 8 independent ports |
| Supported Interfaces | RS-232, RS-422, RS-485 (Full/Half Duplex) |
| UART | Eight 16C550-compatible UARTs |
| FIFO Buffer | 64-byte TX/RX FIFO per channel |
| Baud Rate | Programmable from 150 bps up to 921.6 kbps (higher rates supported on some revisions) |
| PCI Bus | PCI 2.2, 32-bit, 33 MHz |
| Configuration | Software configurable and onboard DIP switches |
| Additional Features | 16-bit timer/counter, 8 universal digital inputs |
| Rear I/O | J4 PMC Rear I/O / PIM422 support |
| Operating Temperature | Industrial temperature range (revision dependent) |
The module provides eight independently configurable serial ports, making it suitable for simultaneously connecting PLCs, HMIs, barcode scanners, intelligent instruments, drives, and other serial field devices.
Product Introduction
The GE PMC422-LAM D2 is a high-density 8-port Serial Controller Module designed using the PMC (PCI Mezzanine Card) standard for embedded industrial computers. It expands serial communication capability while maintaining compatibility with VMEbus, CompactPCI, and other PMC-capable processor boards.
Each communication channel operates independently and can be configured for RS-232, RS-422, or RS-485, allowing one module to communicate with multiple PLCs, sensors, motion controllers, barcode readers, or intelligent field devices simultaneously. The onboard 16C550-compatible UARTs and large FIFO buffers provide stable communication even in high-data industrial environments.
- PMC422-LAM D2
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No serial communication | Incorrect interface selection | ✅ High | Verify RS-232/422/485 configuration | Match hardware settings to connected device |
| One serial port inactive | Cable or UART configuration issue | ✅ High | Test with loopback connector | Verify port parameters before replacing module |
| All ports unavailable | PMC card not recognized | ✅ High | Check BIOS/OS detection and PMC seating | Reseat module and inspect connector |
| Communication errors | Baud rate mismatch | ✅ High | Compare baud rate, parity and stop bits | Configure both devices identically |
| Random communication loss | Termination or grounding problem | ⚠️ Medium | Measure RS-485 termination resistance | Verify network wiring |
| Module not detected | PCI interface fault | ⚠️ Medium | Inspect PMC connector and host carrier | Test in another PMC carrier if available |
| Buffer overrun | Communication speed too high | ⚠️ Medium | Review UART diagnostics | Adjust baud rate or software buffering |
Field Tip: In practice, most PMC422 communication problems are caused by incorrect RS-232/RS-422/RS-485 configuration rather than hardware failure. Before replacing the card, verify the DIP switch settings, serial parameters, cable pinout, and termination resistors. A simple serial loopback test often identifies whether the issue is with the module or the connected equipment.
Frequently Asked Questions (FAQ)
Q1. What is the primary function of the PMC422-LAM D2?
It expands an embedded controller by providing eight independent programmable serial communication ports for industrial automation and embedded computing applications.
Q2. Which serial standards are supported?
The module supports:
- RS-232
- RS-422
- RS-485 (Half Duplex)
- RS-485 (Full Duplex)
Each port can be configured independently to meet application requirements.
Q3. What systems can use this module?
The PMC422-LAM D2 is designed for systems with a PMC (PCI Mezzanine Card) slot, including many VMEbus, CompactPCI, and embedded industrial computers. Compatibility depends on the carrier board and operating system.
Q4. Can different serial protocols be used simultaneously?
Yes. Each of the eight ports operates independently, allowing different ports to be configured for different electrical interfaces and communication settings.
Q5. Is the PMC422-LAM D2 still manufactured?
It is generally considered a legacy product. Most available units are New Surplus or professionally tested surplus inventory, making them suitable for maintaining existing industrial control systems.
Q6. Why do many buyers choose New Surplus units?
New Surplus modules are genuine unused OEM products sourced from excess inventory or canceled projects. They offer an economical solution for supporting legacy automation systems while maintaining compatibility with existing hardware.
Q7. What should I verify before installation?
Experienced embedded-system engineers recommend checking:
- Complete model number ( D2)
- PMC carrier board compatibility
- RS-232/RS-422/RS-485 configuration
- DIP switch settings
- Host operating system driver support
- Baud rate and protocol parameters
- Rear I/O (J4/PIM422) compatibility
- ESD protection during installation
Performing these checks before commissioning resolves most communication issues and helps avoid unnecessary replacement of a functioning serial controller module.
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