Ricoh A230, Руководство по обслуживанию, Страница: 892 / 1134

HOW TO READ THE DUMP LIST
A-2
A230/A231/A232 SM
1.2 HOW TO READ THE DUMP LIST
Data Format
The machine logs the details of layer 1 communication whenever a event has
taken place. The event can be either a request from the machine, a request from
the DSU, a transmission of a signal, or a reception of a signal.
Each log consists of 4 bytes. The first byte indicates the type of event, the second
and the third bytes for optional data, which depends on the type of event, and the
fourth byte indicates the layer 1 status. The following table explains all types of
data formats.
1st byte 2nd byte 3rd byte 4th byte
00(H): TE mode
initialization request 00(H) 00(H) Layer 1 status
01(H): Layer 1
activation request
See note 1 See note 2
TE mode
F1(H): F1 status
F2(H): F2 status
10(H): Layer 1
status has changed F3(H): F3 status
F4(H): F4 status
F5(H): F5 status
02(H): Frame
transmission
request 00(H) Number of
transmitted data
bytes
(Max. 255 bytes)
F6(H): F6 status
F7(H): F7 status
F8(H): F8 status
20(H): Frame
reception indication See note 3 Number of received
data bytes
(Max. 255 bytes)
NT mode
C1(H): G1 status
03(H): TEI
assignment request Assigned TEI value 00(H) C2(H): G2 status
C3(H): G3 status
04(H): Layer 1 de-
activation request
See note 4 See note 2
C4(H): G4 status
05(H): Loop back
mode request 00(H) 00(H) Refer to the “Layer
1 Activation/
06(H): NT mode
initialization request 00(H) 00(H) Deactivation
Procedure” later in
EE(H):
Communication
error See note 5 00(H) this chaper
The data “FF FF FF FF” indicates the end of the data.