GE MM300 Manual page 25
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)
Modbus
Hex
Description
30737
2E0
Sample Index + Trace Memory
Sample18
30738
2E1
Sample Index + Trace Memory
Sample19
30739
2E2
Sample Index + Trace Memory
Sample20
30740
2E3
Sample Index + Trace Memory
Sample21
30741
2E4
Sample Index + Trace Memory
Sample22
30742
2E5
Sample Index + Trace Memory
Sample23
30743
2E6
Sample Index + Trace Memory
Sample24
30744
2E7
Sample Index + Trace Memory
Sample25
30745
2E8
Sample Index + Trace Memory
Sample26
30746
2E9
Sample Index + Trace Memory
Sample27
30747
2EA
Sample Index + Trace Memory
Sample28
30748
2EB
Sample Index + Trace Memory
Sample30
30749
2EC
Sample Index + Trace Memory
Sample31
30750
2ED
Sample Index + Trace Memory
Sample32
30751
2EE
Sample Index + Trace Memory
Sample33
30752
2EF
Sample Index + Trace Memory
Sample34
30753
2F0
Sample Index + Trace Memory
Sample35
30754
2F1
Sample Index + Trace Memory
Sample36
30755
2F2
Sample Index + Trace Memory
Sample37
30756
2F3
Sample Index + Trace Memory
Sample38
30757
2F4
Sample Index + Trace Memory
Sample39
30758
2F5
Sample Index + Trace Memory
Sample40
30759
2F6
Sample Index + Trace Memory
Sample41
30760
2F7
Sample Index + Trace Memory
Sample42
30761
2F8
Sample Index + Trace Memory
Sample43
30762
2F9
Sample Index + Trace Memory
Sample44
30763
2FA
Sample Index + Trace Memory
Sample45
30764
2FB
Sample Index + Trace Memory
Sample46
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Min
Max
Step
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
-32767
32767
1
MODBUS MEMORY MAP
Units
Format Default
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
N/A
F4
0
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2–17
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Table of Contents
Need help?
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