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.
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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
Questions and Answers
-
Can I Use the M-131 with USB-to-serial Adapters?
Yes, with good-quality USB-to-serial adapters that provide proper DTR/RTS signals (to power the M-131) and full RS-232 voltage levels. -
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. -
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. -
How Long Is the M-131 Cable?
The cable is 1.2 metres long, enough for typical workbench setups. -
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 for a PC serial port, so you can control the instrument remotely and log data. -
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, so the M-131 level conversion is essential. -
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. -
Does the M-131 Require External Power?
No. The M-131 is powered from the DTR and RTS signals of your PC's serial port, so it needs no external power adapter. -
What Communication Speeds Does the M-131 Support?
The M-131 supports standard baud rates from 4800 to 38400 bps. 9600 bps is the setting most commonly used with Maynuo instruments.
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