Okuma Alarm-D 4268 PLC communication error

X=0(YY: At the time of channel issuance ZZ: At the time of communicative parameter setting)
YY:
0->It issued an appointed channel
1->In communication task initialization
2->RS232C channel number incorrect
3->A request channel is not mounted
4->Discriminating message address incorrect
5->In standard function (reader/puncher) use
6->In an other in use
ZZ:
0->It issued an appointed channel
1->In communication task initialization
2->RS232C channel number incorrect
3->A request channel is not mounted
4->Discriminating message address incorrect
5->In standard function (reader/puncher) use
6->In an other in use
7->Communication parameter incorrect

X=1->In communication task initialization
2->RS232C channel number incorrect
3->A request channel is not mounted
4->Discriminating message address incorrect
5->In an other in use
6->A transmission error (details exist)
YYZZ:
bit0->A Ready error occurred.(DSR in terms of turn on)
bit1->RS232C devices are not opening for transmission
bit2->It could not write data on working buffer for transmission within prescribed time
bit3->It interrupted management by a compulsory end

X=1->In communication task initial changing
2->RS232C channel number incorrect
3->A request channel is not mounted
4->Discriminating message address incorrect
5->In another use
6->A transmission error (details exist)
YYZZ:
bit0->A parity error occurrence
bit1->An overrun error occurrence
bit2->A framing error occurrence
bit3->A Ready error occurrence
bit4->RS232C devices are not opening at the time of reception
bit5->Working buffer for reception overflowed
bit6->There was not data on working buffer for reception
bit7->It interrupted management by a compulsory end