GE MM300 Manual page 67
Motor management system/low voltage motor protection and control
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Also See for MM300:
- Instruction manual (198 pages) ,
- Quick start manual (77 pages) ,
- Installation recommendations (21 pages)
Table of Contents
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CHAPTER 2: RS485 INTERFACE (MODBUS RTU)
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Code
Type
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
Bit 9
Bit 10
Bit 11
Bit 12
Bit 13
Bit 14
Bit 15
Bit 16
Bit 17
Bit 18
Bit 19
Bit 20
Bit 21
Bit 22
Bit 23
Bit 24
Bit 25
Bit 26
Bit 27
Bit 28
Bit 29
Bit 30
Bit 31
FC168
32 bits
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
Bit 9
Bit 10
Bit 11
Bit 12
Bit 13
Definition
Input/Output 1
Input/Output 2
Input/Output 3
Input/Output 4
Input/Output 5
Input/Output 6
Input/Output 7
Input/Output 8
Input/Output 9
Input/Output 10
Input/Output 11
Input/Output 12
Input/Output 13
Input/Output 14
Input/Output 15
Input/Output 16
Input/Output 17
Input/Output 18
Input/Output 19
Input/Output 20
Input/Output 21
Input/Output 22
Input/Output 23
Input/Output 24
Input/Output 25
Input/Output 26
Input/Output 27
Input/Output 28
Input/Output 29
Input/Output 30
Input/Output 31
Input/Output 32
Contact/Virtual Input/Output Status
Input/Output 33
Input/Output 34
Input/Output 35
Input/Output 36
Input/Output 37
Input/Output 38
Input/Output 39
Input/Output 40
Input/Output 41
Input/Output 42
Input/Output 43
Input/Output 44
Input/Output 45
Input/Output 46
FORMAT CODES
2–59
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Do you have a question about the MM300 and is the answer not in the manual?
Questions and answers
we have a problem with device MM300. it says that the device is invalid through the software and does not read the device. the communication is through RS 485. is it possible to give us an advice or send us some reccomendations or instructions?
For a GE MM300 device that is not recognized by software and communicates via RS485, follow these troubleshooting steps:
1. Ensure correct RS485 wiring:
- Use two-wire RS485 in a daisy chain configuration.
- Install a 120 Ohm resistor in series with a 1 nF ceramic capacitor at each end of the link.
- Use shielded wire and ground the shield at only one location.
2. Check device addressing and termination:
- Confirm proper device address and ensure no address conflicts.
- Verify that termination networks are correctly installed at both ends.
3. Confirm half-duplex communication:
- Ensure that the system supports half-duplex communication and not sending and receiving data simultaneously.
4. If using USB for setup (e.g., USB-to-RS485 converter) and the device is not recognized:
- Repeat the connection procedure 2–3 times.
- If still not recognized, uninstall the USB driver from Device Manager under modems.
- Disconnect the USB cable, wait at least 10 seconds, then reconnect.
- When prompted by the Hardware Wizard, select "No, not this time," then "Install the software automatically," and press "Continue Anyway."
- Finish the installation and check if the USB device appears in the setup software.
These steps help ensure proper hardware connection and correct software recognition of the MM300 device.
This answer is automatically generated