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6.4 APPLICATIONS
The default setting for the communications address from the factory and after a 'Setpoint Dump' is OFF. The
communication speed and parity default settings are 9600 baud, no parity. We have provided a facility to store
the comms. address to any MM3 without using the keypad and display (typically chassis mount MM3s).
Make sure the master is transmitting to the MM3 at 9600 baud, no parity. After installing the MM3 and ensuring
communications is hooked up, cycle control voltage to the MM3 you wish to set the address for. This will allow
you to send a broadcast command with the new comms. address for the MM3. The address must be set within
2 minutes of cycling power. Once the new address is stored or the 2 minutes have elapsed, the MM3 will
ignore all further attempts at changing the comms. address unless power is cycled again. The address is
changed using a broadcast command to comms. address 0 and a command function code. Note: This proce-
dure can be accomplished using the MM3PC software. See Chapter 8: MM3PC SOFTWARE for details.
For example, to store communications address 25 to a new MM3 without a display, we have the following mas-
ter/slave packet format. The master/slave packets have the following format:
Table 6–10: MASTER/SLAVE PACKET FORMAT FOR THE BROADCAST COMMAND (00H)
MASTER TRANSMISSION
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS
NUMBER OF SETPOINTS
BYTE COUNT
DATA 1
DATA 2
DATA 3
6
CRC
SLAVE RESPONSE
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS
NUMBER OF SETPOINTS
CRC
6-14
6.4.2 STORING COMMUNICATIONS ADDRESS USING THE BROADCAST COMMAND
BYTES
1
1
2
2
1
2
2
2
2
BYTES
1
1
2
2
2
MM3 Motor Manager 3
EXAMPLE
DESCRIPTION
00
broadcast command for all units
10
store setpoints
11 60
setpoints address 1160
00 03
3 setpoints = 6 bytes total
06
6 bytes of data
00 05
data for address 1160
00 10
data for address 1161
00 19
data for address 1162
0B 8C
CRC error code
EXAMPLE
DESCRIPTION
00
message from slave responding
10
store setpoints
11 60
setpoint address 1160
00 03
3 setpoints
84 FB
CRC error code
6 COMMUNICATIONS
GE Power Management
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