Flow : DLC ------> NODE
| Field | Type | Description |
|---|---|---|
| nxtqptr | PTRBFHDR | Pointer to next buffer header in a queue |
| hdreptr | PTRBFELT | Pointer to first buffer element |
| numelts | CHAR | Number of buffer elements: 1 |
| msgtype | CHAR | Message type: OPENMSG (0x01) |
| srcl | CHAR | Source locality |
| srcp | CHAR | Source partner |
| srci | INTEGER | Source index |
| destl | CHAR | Destination locality |
| destp | CHAR | Destination partner |
| desti | INTEGER | Destination index |
| ophdr.openqual | CHAR | Open qualifier: RSPERR (0x03) |
| ophdr.opentype | CHAR | Open type: STAT (0x11) |
| ophdr.opresid | INTEGER | Resource identifier |
| ophdr.operr1 | INTEGER | Error code |
| ophdr.operr2 | INTEGER | Reserved |
| Field | Type | Description |
|---|---|---|
| hdreptr–>elteptr | PTRBFELT | Pointer to next buffer element (NULL is only one element) |
| hdreptr–>startd | INTEGER | Index to start of data in this buffer element's data array - 1 |
| hdreptr–>endd | INTEGER | Index to last byte of data in this buffer element's data array |
| hdreptr–>dataru | CHAR[SNANBEDA] | Defined as follows, where s = startd - 1 |
| dataru[s..s+9] | Source name | |
| dataru[s+10..s+19] | Destination name |
The error codes are defined as follows:
| Symbolic constant | Value | Description |
|---|---|---|
| ERLKNOTOPEN | 0x03 | Link not open |
| ERSTATOPEN | 0x05 | Station already open |
| ERNOCB | 0x06 | Station control blocks depleted |
| ERINVINDX | 0x07 | Invalid link index |
| ERMAXSTAT | 0x08 | Limit for number of stations per link reached |
| ERDIFADDR | 0x09 | Address different from that on Request-Open-Station |
| ERBADADDR | 0x0A | Invalid DLC address |