
8–4
MM3 MOTOR MANAGER 3 – INSTRUCTION MANUAL
MM3 MOTOR MANAGER 3 MODBUS PROTOCOL
CHAPTER 8: COMMUNICATIONS
The algorithm is:
1. FFFF hex —> A
2. 0 —> i
3. 0 —> j
4. Di (+) AL —> AL
5. j + 1 —> j
6. shr(A)
7. is there a carry? If No, go to 8; If Yes, G (+) A —> A
8. is j = 8? If No, go to 5; If Yes, go to 9.
9. i + 1 —> i
10. is i = N? If No, go to 3; If Yes, go to 11.
11. A —> CRC
8.1.6
Timing
Data packet synchronization is maintained by timing constraints. The receiving device
must measure the time between the reception of characters. If 3.5 character times elapse
without a new character or completion of the packet, then the communication link must
be reset (i.e. all slaves start listening for a new transmission from the master). Thus at 9600
baud a delay of greater than 3.5
×
1 / 9600
×
10
×
=
×
3.65
×
ms will cause the
communication link to be reset.
Summary of Contents for MM3
Page 8: ...vi MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL TABLE OF CONTENTS ...
Page 18: ...1 10 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL TECHNICAL SPECIFICATIONS CHAPTER 1 INTRODUCTION ...
Page 80: ...4 18 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL CHASSIS MOUNT UNITS CHAPTER 4 SOFTWARE ...
Page 124: ...5 44 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL S7 TESTING CHAPTER 5 SETPOINTS ...
Page 198: ...8 54 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL MODBUS MEMORY MAP CHAPTER 8 COMMUNICATIONS ...
Page 220: ...10 14 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL GE MULTILIN WARRANTY CHAPTER 10 MISCELLANEOUS ...