Appendix H RS422 Communications (Ports P1 & P2)
590 DRV Digital DC Drive Product Manual
App. H - 10
H
Valid Response Message
After the message has been sent, the computer adopts slave status and expects to receive a reply from the 590 Digital
drive. In so doing, the 590 Digital drive assumes master status and, if the 590 Digital drive has successfully received
the message in full, it responds in the following form:
(STX) (C1) (C2) (D1) (D2) (D3)....(DN) (ETX) (BCC)
which constitutes a message defined as:
(STX)
Start of text
(C1)(C2)
Parameter specified by mnemonic
(D1 to DN)
Value of the requested parameter (the string may be of any length as determined by the data). The 590 Digital
drive responds with the shortest message which represents the data value. If the data value is an integer
(decimal part is 0), then it does not send a decimal point. Trailing zeros in the decimal numbers are not sent.
(ETX)
End of text
(BCC)
Block check character - verification digit which is the character generated by taking the exclusive OR of the
ASCII values of all the characters transmitted after and excluding (STX) up to and including (ETX).
For example, in a message where (D1) to (DN) is 5 characters:
(BCC) = (C1) EOR (C2) EOR (D1) EOR (D2) EOR (D3) EOR (D4) EOR (D5) EOR (ETX)
where EOR = Exclusive OR
The computer must check this (BCC) before accepting the reply as valid. Also, the software must be able to extract
the number from the data string taking into account the protocol of the data transmission.
Note: If the 590 Digital drive receives the message but does not recognize the mnemonic, it will
respond with (EOT). The (EOT) returns control to the computer.
Further Inquiry and Termination
The computer then assumes master status again and has three optional responses:
i. Repeat Parameter Facility (NAK)
If the computer transmits a (NAK) after the valid reply, it causes the 590 Digital drive to re-send the parameter that it
just sent. This allows the computer to continually monitor a parameter without having to reestablish the connection.
ii. Scroll Mode Facility (ACK)
If the computer transmits an (ACK) after a valid reply, it causes the 590 Digital drive to fetch the next param-
eter from the parameter list. This facility enables the computer to continuously sequence through all the
parameters of the 590 Digital drive.
iii. Terminate Communication (EOT)
The termination procedure is entered when an instrument is no longer required, when a 590 Digital drive does
not respond to a message, or when a 590 Digital drive replies with an (EOT) character. The computer assumes
master status and transmits an (EOT) character to enable all the instruments on the data link to be responsive to
the next GID-UID address parameter.
Содержание 590 DRV Digital
Страница 2: ......
Страница 16: ...1 4 Chapter 1 Introduction 1 590 DRV Digital DC Drive Product Manual ...
Страница 22: ...2 6 2 Chapter 2 Identification 590 DRV Digital DC Drive Product Manual ...
Страница 45: ...Figure 3 20 Wiring Circuit Diagram for 590 DRV Digital Drive ...
Страница 77: ...5 22 5 590 DRV Digital DC Drive Product Manual Chapter 5 Troubleshooting ...
Страница 103: ...App A 18 A Appendix A Technical Description 590 DRV Digital DC Drive Product Manual ...
Страница 107: ...B Appendix B Using the Man Machine Interface App B 4 590 DRV Digital DC Drive Product Manual ...
Страница 114: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 7 C Figure C 8 Aux I O ...
Страница 120: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 13 C t Figure C 13 Field Control ...
Страница 122: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 15 C Figure C 14 Field Current Variables ...
Страница 124: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 17 C Figure C 15 Field Weakening Variables ...
Страница 126: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 19 C Figure C 16 Current Profile ...
Страница 128: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 21 C t t t Figure C 17 Stop Rates ...
Страница 134: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 27 C Figure C 22 Setpoint Sum ...
Страница 138: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 31 C Figure C 25 Speed Loop ...
Страница 142: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 35 C Figure C 27 Speed Loop Setpoints ...
Страница 144: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 37 C Figure C 28 Current Loop ...
Страница 146: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 39 C Figure C 29 Inhibit Alarms ...
Страница 148: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 41 C Figure C 30 Calibration t ...
Страница 149: ...Appendix C Setup Parameters 590 DRV Digital DC Drive Product Manual App C 42 C ...
Страница 169: ...Appendix D I O Configuration System Menu App D 20 D 590 DRV Digital DC Drive Product Manual Figure D 17 Block Diagram ...
Страница 173: ...Appendix D I O Configuration System Menu App D 24 D 590 DRV Digital DC Drive Product Manual ...
Страница 174: ...Figure D 20 590 DRV Digital DC Drive Software Block Diagram t t t t ...
Страница 202: ...App F 18 Appendix F Spare Parts List 590 DRV Digital DC Drive Product Manual F ...
Страница 208: ...Appendix G RS232 System Port P3 590 DRV Digital DC Drive Product Manual App G 6 G ...
Страница 234: ...Appendix H RS422 Communications Ports P1 P2 590 DRV Digital DC Drive Product Manual App H 26 H ...
Страница 250: ...Appendix J Parameter List by Menu App J 8 J 590 DRV Digital DC Drive Product Manual ...
Страница 258: ...Appendix K Parameter List by Parameter Name 590 DRV Digtial DC Drive Product Manual App K 8 K ...
Страница 318: ...590 DRV Digital DC Drive Product Manual App M 38 Appendix M Special Blocks and Application Notes M ...