Examples of Line Error Message Sequences Involving Host Processor Text Example Sequence 1:

The following message sequence applies UTS 30 rule 4 and host processor rule 5.

1. SQH 1 a p STX data ETX BCC 2. SQH p p ETX BCC

3. EQT EQT ETX BCC

4. SQH 1 a p STX data ETX BCC 5. SQH 1 p _{p ETX BCC}

6. SQH 1 a p D LE 1 ETX BCC

7. SQH 1 p _p OLE 1 ETX BCC

8. EQT EQT ETX BCC

Explanation:

1. Host processor text to the station whose RID is "1" and SID is "a."

2. General traffic poll.

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3. The no-traffic response indicates either that the host processor text message sent in step 1 was not error free when it arrived at the UTS 30 or that the station was not connected and another station in the poll group furnished the no-traffic response. The host processor must resend this text message. (See UTS 30 rule 4.)

4. The host processor text message in step 1 is resent. (See host processor rule 5.) 5. General traffic poll.

6. The acknowledgment indicates that the host processor text sent in step 4 was received error free. (See UTS 30 rule 4.)

7. General traffic poll with acknowledgment.

8. No traffic.

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Example Sequence 2:

SPERRY UTS 30 SINGLE STATION

System Reference UP-9799 Rev. 1

The following message sequence applies UTS 30 rule 4 and host processor rules 1 and 5.

1 . SQH a p STX data ETX BCC 2. SQH p p ETX BCC

3. SQH 1 c p STX data ETX BCC

4. SQH a p STX data ETX BCC 5. SQH p p OLE 1 ETX BCC

6. SQH 1 a p OLE 1 ETX BCC

7. SOH 1 P p OLE 1 ETX BCC

8. EQT EQT ETX BCC

Explanation:

1. Host processor text to the station whose RID is "1" and SID is "a."

2. General traffic poll.

3. The absence of an acknowledgment in the station response indicates either that the host processor text message in step 1 was not error free when it arrived at the UTS 30 or that the station was not connected. (See UTS 30 rule 4.)

4. The host processor must resend the text message sent in step 1. (See host processor rule 1.) Because no acknowledgment was received for the text message in step 1, the host processor may retransmit the message to station "a." (See host processor rule 5.)

5. General traffic poll with acknowledgment.

6. The acknowledgment indicates that the host processor text sent in step 4 was received error free. (See UTS 30 rule 4.)

7. General traffic poll with acknowledgment.

UP-9799 Rev. 1

SPERRY UTS 30 SINGLE STATION System Reference

Example Sequence 3:

The following message sequence applies UTS 30 rule 5 and host processor rules 8, 9, and 12.

1. SOH a p STX data ETX BCC 2. SOH P p ETX BCC

3. No-response condition

4. SOH 1 p p ETX BCC

5. SOH 1 a p OLE 1 ETX BCC

6. SOH 1 ^p p OLE 1 ETX BCC

7. No-response condition

8. SOH 1 p p ETX BCC

9. _{SOH 1 a} p OLE ENO ETX BCC

10. _SOH 1 a p OLE NAK ETX BCC

11. SOH 1 a p OLE 1 ETX BCC

12. SOH 1 ^p p OLE 1 ETX BCC

13. EOT EQT ETX BCC

Explanation:

1. Host processor text to the station whose RID is "1" and SID is "a."

2. General traffic poll.

3. No-response condition indicates transmission error occurred on poll or response.

4. General traffic poll is repeated.

5. Acknowledgment from the station that was sent text in step 1.

6. General traffic poll with acknowledgment.

7. No-response condition indicates transmission error occurred on poll or response.

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8. The poll in step 6 is repeated without the acknowledgment (DLE 1 ). (See host processor rule 8.)

9. Reply request (DLE ENO) from the station whose RID is "1" and SID is "a."

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SPERRY UTS 30 SINGLE STATION

System Reference UP-9799 Rev. 1

10. Retransmission request (OLE NAK) to the station that sent the reply request in step 9. Host processor rule 9 applies because the UTS 30 message (step 5) sent before the reply request did not include text data.

11. This acknowledgment is extraneous, as described in host processor rule 12. It is a repeat of the acknowledgment successfully received in step 5.

12. General traffic poll with acknowledgment.

13. No traffic.

Example Sequence 4:

The following message sequence applies UTS 30 rule 5 and host processor rules 8 and 9.

1. SQH 1 P p ETX BCC

2. EQT EQT ETX BCC

3. SQH a p STX data ETX BCC 4. SQH P p ETX BCC

5. No-response condition

6. SQH 1 P p ETX BCC

7. SOH 1 a p OLE ENO ETX BCC

8. SQH 1 a p OLE NAK ETX BCC

9. SOH 1 a p OLE 1 ETX BCC

10. SQH 1 P p OLE 1 ETX BCC

11. EQT EQT ETX BCC

Explanation:

1. General traffic poll.

2. No-traffic response.

3. Host processor text to the station whose RID is "1" and SID is "a."

4. General traffic poll.

5. No-response condition indicates transmission error occurred on poll or response.

6. General traffic poll is repeated.

UP-9799 Rev. 1

SPERRY UTS 30 SINGLE STATION

System Reference 3-29

8. Retransmission request (DLE NAK) to the station that sent the reply request in step 7. Host processor rule 9 applies because the UTS 30 message (step 2) sent before the reply request did not include text data.

9. This acknowledgment is a retransmission of the UTS 30 message that was not error free in step 5.

10. General traffic poll with acknowledgment.

11. No traffic.

Example Sequence 5:

The following message sequence applies UTS 30 rule 5 and host processo.r rules 5, 8, and 11.

1. SOH 1 P p ETX BCC

2. SOH 1 a p STX data ETX BCC

3. SOH c p STX data ETX BCC 4. SOH 1 P p OLE 1 ETX BCC

5. No-response condition

6. SOH 1 P p ETX BCC

7. SOH 1 c p OLE ENO ETX BCC

8. SOH 1 c p OLE NAK ETX BCC

9. SOH 1 c p OLE 1 ETX BCC

10. SOH 1 P p OLE 1 ETX. BCC

11. EOT EOT ETX BCC

Exp!anation:

1. General traffic poll.

2. UTS 30 text message from the station whose RID is "1" and SID is "a."

3. Host processor text directed to the station whose RID is "1" and SID is "c." (See host processor rule 5.)

4. General traffic poll with acknowledgment.

5. No-response condition indicates transmission error occurred on poll or response.

6. General traffic poll is repeated. (See host processor rule 8.)

7. Reply request from the station whose RID is "1" and SID is "c." (See UTS 30 rule 5.)

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SPERRY UTS 30 SINGLE STATION

System Reference· UP-9799 Rev. 1

8. Retransmission request to the station that sent the reply request in step 7. Host processor rule 11 applies because an acknowledgment was just sent for the station whose RID is "1"

and SID is "a" (steps 2 and 4), but the reply request was from the station whose RID is

"1" and SID is "c."

9. Acknowledgment for the text message in step 3.

10. General poll with acknowledgment.

11. No traffic.

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.5.

Examples of Line Error Message Sequences Involving Passing the Acknowledgment

Example Sequence 1:

The following message sequence applies UTS 30 rule 5 and host processor rules 8 and 9.

1. SQH 1 P p ETX BCC

2. EQT EQT ETX BCC

3. SQH 1 a p STX data ETX BCC 4. SQH P p ETX BCC

5. No-response condition

6. SQH 1 P p ETX BCC

7. SQH 1 c p OLE ENO ETX BCC

8. SQH 1 c p OLE NAK ETX BCC

9. SQH 1 c p OLE 1 STX data ETX BCC

10. SQH 1 P p OLE 1 ETX BCC

11. EQT EQT ETX BCC

Explanation:

1. General traffic poll.

2. No traffic.

UP-9799 Rev. 1

4. General traffic poll.

SPERRY UTS 30 SINGLE STATION System Reference

5. No-response condition indicates transmission error occurred on poll or response.

6. The general traffic poll must be repeated. (See host processor rule 8.)

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7. Reply request (OLE ENO) from the station whose RID is "1" and SID is "c." (See UTS 30 rule 5.)

8. Retransmission request (OLE NAK) to the station that sent the reply request in step 7. Host processor rule 9 applies because the UTS 30 message (step 2) sent before the reply request was a no-traffic message.

9. Acknowledgment-plus-traffic message, where the traffic is text. The station had sent this message in step 5, but it was in error. The acknowledgment (DLE 1) in the message was passed by the multiplexer function from the station whose RID is "1" and SID is "a" (the one to which text was sent in step 3).

10. General traffic poll with acknowledgment.

11. No traffic.

Example Sequence 2:

The following message sequence applies UTS 30 rules 5 and 6 and host processor rules 5, 8, and 10.

1. SOH 1 p _{p ETX BCC}

2. SOH 1 a p STX data ETX BCC

3. SOH 1 c p STX data ETX BCC 4. SOH p p OLE 1 ETX BCC

5. No-response condition

6. SOH 1 p p ETX BCC

7. ^{SOH 1 a p} OLE ENO ETX BCC

8. SOH 1 p _p OLE 1 ETX BCC

9. SOH 1 a p OLE 1 ETX BCC

10. SOH 1 p p OLE 1 ETX BCC

11. EQT EQT ETX BCC

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Explanation:

1. General traffic poll.

SPERRY UTS 30 SINGLE STATION System Reference

2. UTS 30 text from the station whose RID is "1" and SID is "a."

UP-9799 Rev. 1

3. Host processor text to the station whose RID is "1" and SID is "c." (See host processor rule 5.)

4. General traffic poll with acknowledgment.

5. No-response condition indicates transmission error occurred on poll or response.

6. The general traffic poll must be repeated. (See host processor rule 8.)

7. Reply request (OLE ENO) message from the station whose RID is "1" and SID is "a."

8. General traffic poll with acknowledgment. (See host processor rule 10.)

9. Acknowledgment for the text message in step 3. The acknowledgment (OLE 1) was passed by the multiplexer function (from the station whose RID is "1" and SID is "b" to the station whose RID is "1" and SID is "a") at the time the .general traffic poll (step 6) was received by the UTS 30. However, this acknowledgment

wa~

not sent with the reply request in step 7 (UTS 30 rule 6).

10. General traffic poll with acknowledgment.

11. No traffic.

Example Sequence 3:

The following message sequence applies UTS 30 rules 5 and 6 and host processor rules 5, 8, and 10.

1. SOH 1 P p ETX BCC

2. EQT EOT ETX BCC

3. SOH 1 a p STX data ETX BCC 4. SOH P p ETX BCC

5. SOH 1 e p OLE 1 STX data ETX BCC

6. SOH c p STX data ETX BCC 7. SOH P p OLE 1 ETX BCC

8. No-response condition

9. SOH 1 P p ETX BCC

UP-9799 Rev. 1

11. SOH 1 P p OLE 1 ETX BCC

SPERRY UTS 30 SINGLE STATION System Reference

12. SOH 1 e p OLE 1 ETX BCC

13. SOH 1 P p OLE 1 ETX BCC

14. EQT EOT ETX BCC

Explanation:

1. General traffic poll.

2. No traffic.

3. Host processor text to the station whose RID is "1" and SID is "a."

4. General traffic poll.

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5. Acknowledgment plus traffic, where the traffic is text. The text is from the station whose RID is "1" and SID is "c." The acknowledgment was passed by the multiplexer. function from the station whose RID is "1" and SID is "a."

6. Host processor text to the station whose RID is "1" and SID is "c." (See host processor rule 5.)

7. General traffic poll with acknowledgment.

8. No-response condition indicates transmission error occurred on poll or response.

9. General traffic poll is repeated. (See host processor rule 8.)

10. Reply request from the station whose RID is "1" and SID is "e." (See UTS 30 rule 5.)

11. General traffic poll with acknowledgment. Host processor rule applies because the last response (step 5) from the pol I group contained text from the same station that sent the reply request in step 10.

12. Acknowledgment for the text message sent in step 6. The acknowledgment was passed by the multiplexer function (from the station whose RID is "1" and SID is "c" to the station whose RID is "1" and SID is "e") at the time the general traffic poll (step 9) was received by the UTS 30. However, this acknowledgment was not sent with the reply request in step 10 (UTS 30 rule 6).

13. General traffic poll with acknowledgment.

14. No traffic.

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SPERRY UTS 30 SINGLE STATION

System Reference U P-9799 Rev. 1

3.7.6. Example of Line Error Message Sequence Involving Errors During Recovery

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