8-2
IM 77C01H01-10EN
8.2 Frame Configuration
The tables below show the frame configuration of commands sent from the higher-level
device to the UPM100 and that of responses sent from the UPM100 to the higher-level
device. Different elements are used for each category. For details, refer to “8.3 Functions.”
< Frame configuration of data sent from higher-level device to UPM100 >
Number
of bytes
1
1
3
3
Variable length
(0 to 53)
2
1
1
Element
FRAME
LENGTH
(FLEN)
Control
slot P
AP
command
Address
(SA)
Data
BCC
ETX
CR
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
< Frame configuration of data from UPM100 to higher-level device >
Number
of bytes
1
1
3
3
Variable length
2
1
1
Element
FRAME
LENGTH
(FLEN)
Control
slot U
AP
command
Address
(SA)
Data
BCC
ETX
CR
(3)
(1) FRAME LENGTH (FLEN)
FLEN is the total number of bytes of “Control slot” + “AP Command” + “Station
Address” + “Data.” The number is a binary value, but not an ASCII code.
(2) Control Slot (P/U)
This slot determines whether the frame is a command (denoted by P) or a response
(denoted by U).
(3) AP Command
The contents differ depending on the value of the AP command (P or U).
P:
Command
Number of bytes
1
1
1
Element
READ/WRITE
Category (X1)
Data No. (X2)
U:
Response
Number of bytes
1
1
1
Element
READ/WRITE
Category (X1)
Status (S)
READ/WRITE
This slot indicates whether data are read (R), written (W), or re-read (F) (the UPM100
performs the same operation as R).
Category (X1)
Data are largely divided into five categories, denoted by A (measured value), B (statistical
data), C (set item), and E (user control item) (the UPM100 is not designed to handle D).
Содержание UPM100
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