Maynuo Electronic Co Ltd
Maynuo M-131 TTL to RS-232C Adapter
Maynuo M-131 TTL to RS-232C Adapter
SKU: M-131
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Key Features
Overview
The M-131 adapter bridges the communication gap between modern PCs and Maynuo test equipment, converting TTL signal levels to RS-232 standard. Essential for remote control, automated testing, and data acquisition applications.
All Maynuo electronic loads and programmable power supplies feature TTL-level DB9 ports that require voltage level conversion for PC compatibility. The M-131 includes galvanic isolation to prevent ground loops and protect both instruments during measurement operations.
Compatible with standard serial communication software and includes LED status indicators for real-time TX/RX monitoring. For USB connectivity requirements, consider the Maynuo M-133 USB adapter as an alternative.
Why Engineers Choose The Maynuo M-131 TTL to RS-232C Adapter
Essential PC Connectivity
Automated Testing Capability
Cost-Effective Solution
Professional RS-232 Communication Interface
The Maynuo M-131 RS-232C Adapter enables PC-based control and data logging for Maynuo electronic loads and programmable power supplies. This essential interface cable converts TTL voltage levels from the instrument's DB9 connector to standard RS-232 levels required for computer serial communication.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Input (Instrument Side) | TTL levels (+5V logic) |
| Output (PC Side) | RS-232 levels (±12V) |
| Interface | DB9 male to DB9 female |
| Isolation | Galvanic isolation included |
| Status LEDs | TX/RX activity indicators |
| Cable Length | 1.2 metres |
Wiring Quick-Start
The M-131 provides essential voltage level conversion between your Maynuo instrument's TTL signals and your computer's RS-232 serial port:
Instrument Side (TTL): M-131 Adapter: PC Side (RS-232): Pin 1: +5V ————————————————→ Level Shifter ————————————→ Pin 1: DCD Pin 2: TXD ———————————————→ MAX232 IC ————————————————→ Pin 2: RXD Pin 3: RXD ←————————————— Signal Isolation ←————————— Pin 3: TXD Pin 5: GND ←————————————— Ground Reference —————————— Pin 5: GND Compatible Instruments
Works with all Maynuo electronic loads and programmable power supplies featuring the DB9 TTL communication port, including:
- M97 Series Electronic Loads (M9711, M9712, M9713, M9714, M9715, M9716, M9717, M9718)
- M98 Series LED Electronic Loads (M9811, M9812, M9812B)
- M88 Series Programmable Power Supplies (M8811, M8812, M8813, M8831)
- High-power M983X series loads
Software Integration
Use with Maynuo's free PC software for:
- Remote instrument control
- Automated test sequences
- Data logging and analysis
- Custom SCPI command programming
Frequently Asked Questions
Have a Question?
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How long is the M-131 cable?
The cable length is 1.2 metres, providing sufficient reach for typical workbench configurations while maintaining signal integrity.
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What software works with the M-131 adapter?
Use Maynuo's free PC software, standard serial terminal programs, or custom applications using SCPI commands for automated testing and data acquisition.
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Does the M-131 include galvanic isolation?
Yes, the adapter provides galvanic isolation to prevent ground loops and protect both your instrument and PC during measurements.
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What's the difference between M-131, M-132, and M-133 adapters?
M-131 provides RS-232 output, M-132 offers RS-485 communication, and M-133 converts directly to USB. Choose based on your PC connectivity requirements.
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Can I use the M-131 with USB-to-serial adapters?
Yes, the M-131 works perfectly with quality USB-to-serial adapters that provide proper DTR/RTS signals for power and full RS-232 voltage levels.
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What communication speeds does the M-131 support?
The adapter supports standard baud rates from 4800 to 38400 bps, with 9600 bps being the most commonly used setting for Maynuo instruments.
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Does the M-131 require external power?
No, the M-131 is powered from the DTR and RTS signals from your PC's serial port, eliminating the need for external power adapters.
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Which Maynuo instruments are compatible with the M-131?
All Maynuo electronic loads (M97, M98, M983X series) and programmable power supplies (M88 series) with DB9 communication ports work with the M-131 adapter.
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Can I connect my Maynuo instrument directly to a PC without the M-131?
No, never connect the instrument's TTL DB9 port directly to a PC RS-232 port. The voltage levels are incompatible and may damage your equipment. The M-131 level conversion is essential.
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What is the M-131 adapter used for?
The M-131 converts TTL voltage levels from Maynuo electronic loads and power supplies to RS-232 levels compatible with PC serial ports, enabling remote control and data logging.