Chapter 7 Automatic Sending/Receiving function (ASR)
EH-ETH2 is able to request to open connection to other stations by setting “Request to open bit” to high.
The procedure to open ASR connection 1 is shown as
Figure 7.8.
Register name
C1CSR.OPC1
(1) (5) (6)
CNCR.OPN1
(2) (3)
C1ESR.OE1
(4)
EC1CR.OEC1
: By user, : By EH-ETH2
Figure 7.8 Procedure to open connection
(1) Confirm ASR connection is not opened (C1CSR.OPC is 0) and the status is not open error (C1CSR.OPC is 0).
Then set 1 to CNCR.OPN1.
------------------------------------------------------------------------------------------------------------------------Request to open
(2) EH-ETH2 receives the request and set 1 to C1ESR.OE1 because it is not ready to be opened.
----------------------------------------------------------------------------------------------------------------------------- Open error
(3) Confirm the open error reply and set 0 to CNCR.OPN1 and 1 to EC1CR.OEC1
------------------------------------------------------------------------- Cancellation of the request to open and clear error bit
(4) EH-ETH2 receives the request to clear and clear C1ESR.OE1 by setting 0.
-------------------------------------------------------------------------------------------------------------- Clear the open error bit
(5) Examine the error cause and remove. Then set 0 to EC1CR.OEC1 and set 1 to CNCR.OPN1 again after
confirmation of C1CSR.OPC=0 and C1ESR.OE1=0.
------------------------------------------------------------ Cancellation of the request to clear error bit, and request to open
(6) EH-ETH2 receives the request and open the ASR connection 1 and set 1 to C1CSR.OPC1
--------------------------------------------------------------------------------------------------------------------Connection opened
(7) Confirm the connection opened (C1CSR.OPC=1) and cancel the request to open (CNCR.OPN1=0)
-------------------------------------------------------------------------------------------------Cancellation of the request to open
7-7
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