5-59 ●Communication Buffer 
5.9.4 Errors
 (1) Errors during external communications
Errors during print content transmission and print data call-up
No. Condition Type of error
1
Not all received print contents could be held in buffer because 
its capacity was exceeded
NAK is returned. 
However, this will not cause any 
external communication error.
2 Number of print items of received contents is more than 9. External communication error 030
3
Calendar or count character was included in print data call-up 
transmission
External communication error 027
Error when buffer is cleared
No. Condition Type of error
1 Text was transmitted together with another text External communication error 002
(2) Errors during printing
Errors during printing
No. Condition Type of error
1
The number of received contents in buffer was less than "Data 
number at Fault".
Fault "Communication Buffer 
Fault"
2
Print start signal was received during print data switching 
immediately after ACK was returned to "restart printing"
Fault
"Invalid Data Change Timing"
● When "communication buffer fault" occurs, the window will be cleared, followed by standby 
status.
(3) Error when status is changed
Error when status is changed
No. Condition Type of error
1
Calendar characters or count characters were included to 
existing print contents when restored to online.
Confirmation message
"Communication buffer error"