# Outline of the Command Response Log

The time when the signal was sent / received. If you pull back and forth, you will know the time of that signal.
e.g.)
02467-> PIX 03289-> PPS-MPS 03289 – 02467 = 822 x 10 ms = approx. 8.2 s image signal time

Direction of signal transmission and reception. This differs from that of the sending or receiving in fax communication.
When sending a fax, signals (including image signal) and response signal become sending and receiving respectively.

Defined in the first 2 digits (8bit) or 4 digits (16bit) of data in the FCF (Facsimile Control Field).

Data is composed of FCF (Facsimile Control Field) and FIF (Facsimile Information Field).

The first 2 digits (8 bits) or 4 digits (16 bits) represent the FCF, and the rest represent the FIF.

Example1)
03289 -> PPS - MPS､ BF4F000031
FCF = BF4F = PPS - MPS
FIF = 00 = PC (page counter) Page 1 (0x00 ~ 0xFF = 0 ~ 255 = + 1 and page 1 ~ 256)
00 = block 1 in the BC (block counter) page (0x00 ~ 0xFF = 0 ~ 255 = + 1 and block 1 ~ 256)
31 = FC (flame counter) Number of frames 50 (0x00 ~ 0xFF = 0 ~ 255 = +1 and frames 1 ~ 256)
1 block consists of 256 frames. If the number of frames exceeds 256, the page is separated by PPSNULL and transmitted separately.

Example2)
PPS-NULL BF00xxxxFF
FCF=BF00 FIF=
FPS of the first PPS-NULL on the first page: 0000FF = page 1, block 1, frame 256
2nd PPS-NULL FIF on page 1: 0001FF = page 1, block 2, frame 256
First PPS-NULL FIF on page 2: 0100FF = page 2, block 1, frame 256