West Control Solutions KS 800 ISO1745 Interface Manual - Manual (Page 7)

q
for data request: RDR (Request Data with Reply)
data request with reply in one message cycle.
Data flow direction : KS800 r Master
a) Master EOT
b) KS800 STX ETX BCC NAK
1)
no reaction
2)
c) Master
EOT
or continue with a
repeat a,
or EOT
(1)
after timeout:
EOT or continue with a
(2)
2.2.1 Transmission control characters
The following transmission control characters are used:
Abbreviation HEX Description
STX 02 Start of Text - data introduction
ETX 03 End of Text - end of data
EOT 04 End of Transmission - reset the interface units or transmission cancelation
ENQ 05 Enquiry - request for reply
ACK 06 Acknowledge - confirmation
NAK 15 Not Acknowledge - no confirmation
2.2.2 Character format
Numbers and characters in the address, identification or data field are always transmitted as ASCII
characters.
The following 7-bit ASCII characters with parity (EVEN) are valid
CHR HEX Description
, 2C Comma as separator
= 3D Separator between identification and value
0...9 30...39 Values for numbers and codes
B 41 Additional for codes
:...? 3A...3F Values for floating point format (FP)
@... 40...7F Values for status and control bytes
... 20...7F Characters for text string (CHAR16)
. 2E Decimal point
Interface protocol
7 9499 040 49411
1) Possible after disturbance of transmission or after sending inadmissible data.
2) Possible after KS 800 failure, bus failare or faulty address specification.