Sharp ER-A57R1 Service Manual page 8

DATA ACK
packet packet
F F
DA DA
SA SA
0 1
CH NO CH NO
DLS DLS
BCL 0
BCH 0
CRC
CRC
DATA F
CRC
CRC
F
Fig. 3-4 Types of packets
10. Transmission Procedure
1 Normal sequence
[Sequence]
Data
RACK
2 Abnormal sequence-1
(when there is a single data error)
Data
15ms
Data
(Retry)
RACK
NOTE: X
3 Abnormal sequence-2
(when there are six successive data errors)
Data
15ms
Data
(Retry-1)
Data
(Retry-5)
15ms
PACK NRDY
packet (Not ready)
packet
F F
DA DA
SA SA
1 1
CH NO CH NO
DLS DLS
0 0
0 0
CRC CRC
CRC CRC
F F
Control packet
[Receiving side]
ACK
X
(No ACK)
ACK
Indicates an error.
X
(No ACK)
X
(No ACK)
X
(No ACK)
Communication is disabled due to full retry counts . . . "PW-OFF"
(power off) will be printed on the master unit.
4 Abnormal sequence-3 (when ACK is in error)
Data
(No ACK)
RACK
5 Abnormal sequence-4 (when RACK is in error)
Data
RACK
Full ACK retry counts. If RACK were not detected after five retries
to send ACK, it assumes RACK to be in error, and so the receiving
operation terminates normally.
6 Abnormal sequence-5
(receiving side not enabled to receive data)
Data
11. Terminal Number Assignment
when the IRC option is installed, an IRC terminal number must also
be supplied. This number is in the range of 1 to 254. The number is
specified in the PGM 2 mode at installation time. It is necessary to
specify an number for each device connected to the IRC including the
master. It should be noted that the IRC terminal number and the
register number are not related. Section 10 of this manual indicates
how this number is specified.
•
IRC terminal number (3 digits max.): *000 ∼ 254
*000: OFF line machine
•
Register number (4 digits max.): *0 ∼ 9999
*0: can not be used in the IRC operation.
1 ™ 5
X ACK
6ms
ACK
ACK-1
6ms
X
ACK-2
ACK-5
NRDY