Confirm Error By Status Register (Sr) - Hitachi EH-150 Applications Manual

9.3.3

Confirm error by Status Register (SR)

EH-ETH2 has internally Status Register (SR) which stores communication status for each ASR connection.
You can monitor this SR and program the retry circuit when the communication error occurs. See the
"Chapter 8 Register Structure" for detailed Status Register information.
(1) Open error detected
When open error occurs at the ASR connection of passive station, bit 0 of Connection n error status register
(CnESR): open error bit (OEn) is 1.
To confirm if error occurs in open procedure, read this open error bit as occasion demand.
(2) Transmission error detected
When send error occurs at the ASR connection, bit 5 of Connection n error status register(CnESR): send error bit
(SNEn) is 1.
(3) Receive error detected
When receive error occurs at ASR connection, bit 4 of Connection n error status register (CnESR): receive error
bit (RCEn) is 1.
(4) Receive area error detected
When the size of received data exceeds receive area size at ASR connection, bit 3 of Connection n error status
register (CnESR): receive area error bit (RAEn) is 1.
CAUTION
The following errors can not be detected in the Status Register.
Breaking wire or hardware connection error during on line communication (connection open)
Trouble on other stations during on line communication (connection open)
Chapter 9 Maintenance, check, error
9-6