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2 Simple Application Controllers
The Command String 7
7 - 10
3 ) WRITE Message - BIT data
The maximum number of BIT devices that can be written at any one time is restricted by
the maximum number of communication bytes (250 bytes) contained in a single message.
Each device is represented by the Device code, Device No, (LB), Device No. (HB) and
Device Status (1byte).
(Max No. of Comm. bytes - (Format No. + Stat No. + Command + No. of Devices)) /
(Device code + Device No(LB) + Device No. (HB) + Device Status) =
(250 - 4) / 4 = 246 / 4 = 61
Therefore, the user can write 1 - 61 BIT devices at any one time.
4 ) WRITE Message - WORD data
The maximum number of WORD devices that can be written at any one time is restricted
by the maximum number of communication bytes (250 bytes) contained in a single mes-
sage. Each device is represented by the Device code, Device No, (LB), Device No. (HB),
Device Status (LB) (1byte) and Device Status (HB) (1byte).
(Max No. of Comm. bytes - (Format No. + Stat No. + Command + No. of Devices)) /
(Device code + Device No(LB) + Device No. (HB) + Device Status(LB) + Device Sta-
tus(HB)) =
(250 - 4) / 5 = 246 / 5 = 49
Therefore, the user can write 1 - 49 WORD devices at any one time.
5 ) Time Switch READ Message.
The READ operation of a Time Switch settings follows the identical structure to reading a
Communication Word device in Format B. The maximum number of Time Switch devices
that can be read at any one time is restricted by the maximum number of communication
bytes (250 bytes) contained in the reply message.
(Max No. of Comm. bytes - (Format No. + Stat No. + Command + No. of Devices)) /
(RTC0 + RTC1 + RTC2 + RTC3) =
(250 - 4) / 4 = 246 / 4 = 61
Therefore, the user can read 1 - 61 Time Switch settings at any one time.
Refer to section 7.6.5 for further infromation concerning Time Switch settings.
6 ) Time Switch WRITE Message
The maximum number of Time Switch devices that can be read at any one time is
restricted by the maximum number of communication bytes (250 bytes) contained in a sin-
gle message. Each device is represented by the Device code, Device No, (LB), Device No.
(HB), RTC+0, RtTC+1, RTC+2 and RTC+3.
(Max No. of Comm. bytes - (Format No. + Stat No. + Command + No. of Devices)) /
(Device code + Device No(LB) + Device No. (HB) + RTC0 + RTC1 + RTC2 + RTC3) =
(250 - 4) / 7 = 246 / 7 = 35
Therefore, the user can write 1 - 35 Time Switch settings devices at any one time.
Refer to section 7.6.5 for further infromation concerning Time Switch settings.
A mixture of Time Switch, BIT and WORD data can be sent via one Transmit mes-
sage.