Hawking Technology MC4-H2 - Manual (Page 8)

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Front Panel Push Buttons:
Hold down the buttons for port A and port D simultaneously for 3 seconds on the unit where you want to change the address.
When you see the LED's begin to flash this indicates that the address can now be changed for this unit. Press any of the front
panel buttons to cycle the address from Master, to Slave 1, to Slave 2 and then back to Master. As the address cycles, you will
see the port number on the front panel LED's changing between the following combinations:
1 2 3 4 or 5 6 7 8 or 9 10 11 12
When you have the proper address selected, press and hold down simultaneously the buttons of port A and port D on the unit.
When the LED's stop blinking, this will indicate that the address has been set. (about 3 seconds)
Serial Control:
You may only change the address of the MC4-H2 unit that you are connected to via a serial cable. Send the following command
to the MC4-H2 to change the address of the box, which you are connected to via the serial cable.
A
x - where "x” is the address you want this unit to have.
The address commands are "M" for Master, "1" for Slave 1, and "2" for Slave 2
Examples:
AM - set this unit's address to Master (Ports 1-4)
A1 - set this unit's address to Slave 1 (Ports 5-8)
When an address is changed, that unit announces its new address to any other MC4-H2’s or MC4-H2-SW’s that it is connected
to via the chain cable. If any unit already has this address, it will loose its address to the unit that just changed addresses. Here is
an example.
Let’s say you have two MC4-H2 or MC4-H2-SW units. Call them Unit A and Unit B. Unit A is set as the Master and Unit B is
set as the Slave 1. If you were to change the address of Unit B to the master, Unit A will have to give up its address since Unit B
has now taken the Master address. Unit A will now not have an address and the LED’s will be blinking “00”. Give Unit A an
address by following the front panel method or the serial method.
Note: If a unit has no address, the LED’s are flashing “00”, you will still need to hold down the buttons on port A and
port D for 3 seconds and the press any front panel button to select a new address and then continue with the
Front Panel address changing method.