GE MM300 Manual page 43
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
41309
051C
Timer 25 Type
41310
051D
Timer 25 Pickup Delay
41311
051E
Timer 25 Dropout Delay
41312
051F
Reserved
▼
▼
▼
41316
0523
Reserved
41317
0524
Timer 26 Type
41318
0525
Timer 26 Pickup Delay
41319
0526
Timer 26 Dropout Delay
41320
0527
Reserved
▼
▼
▼
41324
052B
Reserved
41325
052C
Timer 27 Type
41326
052D
Timer 27 Pickup Delay
41327
052E
Timer 27 Dropout Delay
41328
052F
Reserved
▼
▼
▼
41332
0533
Reserved
41333
0534
Timer 28 Type
41334
0535
Timer 28 Pickup Delay
41335
0536
Timer 28 Dropout Delay
41336
0537
Reserved
▼
▼
▼
41340
053B
Reserved
41341
053C
Timer 29 Type
41342
053D
Timer 29 Pickup Delay
41343
053E
Timer 29 Dropout Delay
41344
053F
Reserved
▼
▼
▼
41348
0543
Reserved
41349
0544
Timer 30 Type
41350
0545
Timer 30 Pickup Delay
41351
0546
Timer 30 Dropout Delay
41352
0547
Reserved
▼
▼
▼
41356
054B
Reserved
41357
054C
Timer 31 Type
41358
054D
Timer 31 Pickup Delay
41359
054E
Timer 31 Dropout Delay
41360
054F
Reserved
▼
▼
▼
41364
0553
Reserved
41365
0554
Timer 32 Type
41366
0555
Timer 32 Pickup Delay
41367
0556
Timer 32 Dropout Delay
41368
0557
Reserved
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Min
Max
Step
0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
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---
0
2
1
0
1000
1
0
1000
1
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▼
▼
▼
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0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
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---
---
0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
---
---
---
0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
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0
2
1
0
1000
1
0
1000
1
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▼
▼
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0
2
1
0
1000
1
0
1000
1
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---
▼
▼
▼
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---
---
0
2
1
0
1000
1
0
1000
1
---
---
---
MODBUS MEMORY MAP
Units
Format Default
---
FC141
0
---
F1
1
---
F1
1
---
---
---
▼
▼
▼
---
---
---
---
FC141
0
---
F1
1
---
F1
1
---
---
---
▼
▼
▼
---
---
---
---
FC141
0
---
F1
1
---
F1
1
---
---
---
▼
▼
▼
---
---
---
---
FC141
0
---
F1
1
---
F1
1
---
---
---
▼
▼
▼
---
---
---
---
FC141
0
---
F1
1
---
F1
1
---
---
---
▼
▼
▼
---
---
---
---
FC141
0
---
F1
1
---
F1
1
---
---
---
▼
▼
▼
---
---
---
---
FC141
0
---
F1
1
---
F1
1
---
---
---
▼
▼
▼
---
---
---
---
FC141
0
---
F1
1
---
F1
1
---
---
---
Size in
Words
1
1
1
1
▼
1
1
1
1
1
▼
1
1
1
1
1
▼
1
1
1
1
1
▼
1
1
1
1
1
▼
1
1
1
1
1
▼
1
1
1
1
1
▼
1
1
1
1
1
2–35
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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