Instruction manual

5. RKC COMMUNICATION PROTOCOL
IMR01H02-E3
17
• Single mode
This data represents the device address and channel number of the controller to be polled. When
polling any identifier without the corresponding channel number, the channel number is ignored.
Each address is calculated as follows.
Calculation method of address:
Address = Device address of controller + Controller channel number - 1
Example: When 3 controllers (MA900: 4 channels) are multidrop-connected
Controller 1 Device address 00 + CH1 - 1 = Address 00
Device address 00 + CH2 - 1 = Address 01
Device address 00 + CH3 - 1 = Address 02
Device address 00 + CH4 - 1 = Address 03
Controller 2 Device address 04 + CH1 - 1 = Address 04
Device address 04 + CH2 - 1 = Address 05
Device address 04 + CH3 - 1 = Address 06
Device address 04 + CH4 - 1 = Address 07
Controller 3 Device address 08 + CH1 - 1 = Address 08
Device address 08 + CH2 - 1 = Address 09
Device address 08 + CH3 - 1 = Address 10
Device address 08 + CH4 - 1 = Address 11
2. Memory area number (2 digits)
This is the identifier to specify the memory area number. It is expressed by affixing “K” to the
head of each memory area number (from 1 to 8). In addition, if the memory area number is
assigned with “K0,” this represents that control area is specified.
The memory area now used for control is called “Control area.”
If the memory area number is not specified when polling the identifier corresponding to
the memory area, this represents that the control area is specified.
If any identifier not corresponding to the memory area is assigned with a memory area
number, this memory area number is ignored.
Device address
of controller
Controller
channel number
Addresses used in
polling sequence
For example, if Address 10 is
selected CH3 corresponding to
Controller 3 is urged to send
data.
Set the device address number of the succeeding controller to four or more than four plus the same
number of the previous controller. Otherwise (for example, if set to 00, 01 and 02 between Controllers
1, 2 and 3), the address used for polling is duplicated and as a result no normal communication can be
made.
In case of the MA901:
Set the device address number of the succeeding controller to eight or more than eight plus the
same number of the previous controller.
Controller 1: Device address 00, Controller 2: Device address 08, ..........