Signals Transmitted By The Receiver (Unique To Ecm Communication - Canon G3 Error Code List

EOR-Q (End of Retransmission-Q)
The last block of a single page may have an error frame, causing it to be transmitted
repeatedly. The signal is used to stop retransmission of the block. Those signals used to
do so (EOR-EOP, EOR-EOM, EOR-MPS) are at times generically called EOR-Q.
EOR-EOP (End of Retransmission-EOP)
It is used to stop retransmission of a block, and means the same as EOP.
EOR-EOM (End of Retransmission-EOM)
It is used to stop retransmission of a block, and means the same as EOM.
EOR-MPS (End of Retransmission-MPS)
it is used to stop retransmission of a block, and means the same as MPS.
EOR-PRI-Q (End of Retransmission-PRI-Q)
The last block of a single page may have an error frame, causing it to be transmitted
repeatedly. Those signals used to stop retransmission while indicating that the operator
may be called (EOR-PRI-EOP, EOR-PRI-EOM, EOR-PRI-MPS) are at times generically
called EOR-PRI-Q.
EOR-PRI-EOP (End of Retransmission-PRI-EOP)
It is used to stop retransmission of a block, and means the same as PRI-EOP.
EOR-PRI-EOM (End of Retransmission-PRI-EOM)
It is used to stop retransmission of a block, and means the same as PRI-EOM.
EOR-PRI-MPS (End of Retransmission-PRI-MPS)
It is used to stop retransmission of a block, and means the same as PRI-MPS.
CTC (Continue to Correct)
The same block may be transmitted repeatedly because of the presence of an error frame.
The signal is transmitted when PPR has been received 4 times for the same block, and is
used to communicate fall-back to the receiver.
RR (Receive Ready)
In response to RNR, it is used to ask the receiver whether it has become ready for recep-
tion.

2.8 Signals Transmitted by the Receiver (unique to ECM communication)

PPR (Partial Page Request)
It is transmitted when an error exists in a received block, indicating the number of the
frame suffering the error.
ERR (Response for End of Retransmission)
It is transmitted in response to EOR sent to stop retransmission of a block by the transmit-
ter, indicating that an end will be accepted.
CTR (Response for Continue to Correct)
It is transmitted in response to CTC sent by the transmitter, indicating that fall-back will
be accepted.
RNR (Receive Not Ready)
When a block has been received and, as a result, the reception buffer (memory) becomes
full, the signal is transmitted to indicate that the machine will not be able to receive the
next block. RNR will be repeatedly sent in response to RR of the transmitter until the
reception buffer becomes available after the end of printing.
A-9
Appendix