Eurotherm Drives 584S, Product Manual

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Chapter 8 - Appendices
584S Frequency Inverter 8 -11
Termination
Termination Termination
Termination
The termination procedure is used if the computer wishes to stop selecting a particular 584S and establish connection with
another. This is achieved by sending the 'establish connection' sequence. The computer retains Master status and transmits
an (EOT) character to reset all instruments on the data link to be responsive to the next GID-UID address parameter.
INITIAL
ENTRY
E
O
T
ADD
RE
ENTRY
E
O
T
RE
ENTRY
PHASE (A)
PHASE (B)
M ESSAGE TRANSFER
TERM INATION
ESTABLISH
CONNECTIO N
PROTOCOL
PROCEDURE
SENDER
SUPERVISOR
STATUS
STATUS
SLAVE
M ASTER
SUPERVISORY
SLAVE SLAVE SLAVE
M ASTER M ASTER M ASTER
SUPERVISOR
584
S
T
X
CM D DATA BCC
R
T
X NO
REPLY
A
C
K
N
A
K
(VALID)
(INVALID)
SUPERVISOR
Figure B.3 - Sending Data to the 584S
Binary Communications
This mode has many similarities with the ASCII mode. This document mainly concentrates on presenting those parts which
are different from the ASCII mode.
Specifications Specifications Specifications Specifications
Character Format Character Format Character Format Character Format
Each data-word is transmitted as 11 bits rather than adapting the 10-bit format used by the ASCII mode. This is because a
control bit is used which is cleared in control characters and set in data characters. The format is as follows:
1 Start bit (lo)
7 Data bits (LSB first)
1 Control bit*
1 Even parity bit
1 Stop bit (hi)
* Logic 0 = Control character
* Logic 1 = Data character
The Message The Message The Message The Message
The message received from the supervisor can be in any of several types. They can be divided into two categories:
a)
"main messages"
b) "continuation messages"
Before presenting the format of these messages, the following gives the symbols they use. These symbols used in the
messages are divided into two types; "control characters" and "data characters".
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