Datasheet

1.2 Information Transmitted on the Loop
C141-C008 1-7
The K28.5 special character is always used as the first character of all ordered
sets.
K28.5 Dxx.y Dxx.y Dxx.y
Figure 1.5 Format of ordered sets
1.2.1.1 Primitive signals
Primitive Signals have a control function to indicate status of the drive or to
perform some operation to the port being connected.
Primitive Signals are recognized when one ordered set is detected.
A minimum of six Primitive Signals must be transmitted between each frame.
The name and the function of Primitive Signals is below.
a) Idle; to indicate the port can transmit or receive the frame
b) R_RDY; to indicate the port has an area for receiving the frame
c) ARBx; to request the right to use the loop. x = AL_PA of the requesting port
d) ARB (FO); to request the right (= lowest priority) to use the loop
e) OPN; to inform the transmission of the frame to the destination port
f) CLS: to inform the release of the loop
1.2.1.2 Frame delimiters
Frame Delimiters mark the beginning and end of frames.
They are called Start-of-frame (SOF) delimiters and End-of-frame (EOF)
delimiters.
1.2.1.3 Primitive sequence
Primitive Sequence is a control function and requires to be detected.
The name and the function of Primitive sequence is below.
a) LPB; When received, the drive enables the port bypass circuit and bypasses
the loop.
b) LPE; When received, the drive disables the port bypass circuit and connects
to the loop.