GE MM300 Manual page 41
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)
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CHAPTER 2: RS485 INTERFACE (MODBUS RTU)
Modbus
Hex
Description
▼
▼
▼
41188
04A3
Reserved
41189
04A4
Timer 10 Type
41190
04A5
Timer 10 Pickup Delay
41191
04A6
Timer 10 Dropout Delay
41192
04A7
Reserved
▼
▼
▼
41196
04AB
Reserved
41197
04AC
Timer 11 Type
41198
04AD
Timer 11 Pickup Delay
41199
04AE
Timer 11 Dropout Delay
41200
04AF
Reserved
▼
▼
▼
41204
04B3
Reserved
41205
04B4
Timer 12 Type
41206
04B5
Timer 12 Pickup Delay
41207
04B6
Timer 12 Dropout Delay
41208
04B7
Reserved
▼
▼
▼
41212
04BB
Reserved
41213
04BC
Timer 13 Type
41214
04BD
Timer 13 Pickup Delay
41215
04BE
Timer 13 Dropout Delay
41216
04BF
Reserved
▼
▼
▼
41220
04C3
Reserved
41221
04C4
Timer 14 Type
41222
04C5
Timer 14 Pickup Delay
41223
04C6
Timer 14 Dropout Delay
41224
04C7
Reserved
▼
▼
▼
41228
04CB
Reserved
41229
04CC
Timer 15 Type
41230
04CD
Timer 15 Pickup Delay
41231
04CE
Timer 15 Dropout Delay
41232
04CF
Reserved
▼
▼
▼
41236
04D3
Reserved
41237
04D4
Timer 16 Type
41238
04D5
Timer 16 Pickup Delay
41239
04D6
Timer 16 Dropout Delay
41240
04D7
Reserved
▼
▼
▼
41244
04DB
Reserved
41245
04DC
Timer 17 Type
41246
04DD
Timer 17 Pickup Delay
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Min
Max
Step
▼
▼
▼
---
---
---
0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
---
---
---
0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
---
---
---
0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
---
---
---
0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
---
---
---
0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
---
---
---
0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
---
---
---
0
2
1
0
1000
1
0
1000
1
---
---
---
▼
▼
▼
---
---
---
0
2
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
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
2–33
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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