6100 BSC Programming Manual

6100 BSC Link and Station Management
TRANSITIONS FROM CONTROL STATE. The following events cause
transitions from CONTROL STATE to other states:
• The application makes a request that results in a successful
line bid. For example, it makes a WRITE request to bid for
the line and send the first message; the state changes from
CONTROL to WRITE. Alternatively, it makes a READ request
to accept a bid and receive the first message; the state
changes from CONTROL to READ.
• A modem failure causes DSR to drop, or the application
makes a STOP request. The state changes to DISCONNECTED;
BSC reports an error to the application.
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| |
| |
| Original State: CONTROL |
| |
| Request Status Code Description New State |
| |
| WRITE 0 Normal completion WRITE |
| 140 Modem error DISCONNECTED |
| 161 6100 error DISCONNECTED |
| 162 Timeout WRITE |
| 164 DLE EOT received DISCONNECTED |
| 165 RVI reply to block WRITE |
| 166 ENQ reply to bid CONTROL if |
| primary, READ|
| if secondary |
| 173 NAK reply to block WRITE |
| 175 Invalid acknowl. WRITE |
| 177 Reply too long CONTROL if |
| (to bid or block) bid, WRITE |
| if block |
| 190 6100 error DISCONNECTED |
| other CONTROL |
| READ 0 Normal completion READ |
| 140 Modem error DISCONNECTED |
| 161 6100 error DISCONNECTED |
| 164 DLE EOT received DISCONNECTED |
| 190 6100 error DISCONNECTED |
| other CONTROL |
| |
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Figure 2-4. Completion Status to Leave CONTROL State
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