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Page 138
2000-1252-01
Released Rev. C
VersaPort 2200 Technical Manual
Appendix B: Communications Software
SECS Communication
a
SECS Communication
SECS Guidelines
Serial Parameters
Communications parameters must be set up prior to utilizing the serial port:
• Baud Rate:9600 (default)
• Parity:None
• Stop
Bits:1
• Data
Bits:8
NOTE . . .
B
AUD
RATES
OF
2400, 4800,
AND
19200
BAUD
ARE
ALSO
SUPPORTED
IN
THE
V
ERSA
P
ORT
FIRMWARE
.
Communications Protocol
Information is transmitted within formatted message blocks, preceded by control
characters.
gives a list of control characters, and
the message block.
The protocol for sending a single block of data is as follows:
T
ABLE
18
List of Control Characters
Control
Character
HEX
Value
Meaning
ENQ
05
Line Bid
EOT
04
Accept Bid
ACK
06
Positive Acknowledge
NAK
15
Negative Acknowledge
F
IGURE
44
SECS Message Block
1
2
3
4
5
6
7
8
9 10
DEVICE ID
STREAM
AND
FUNCTION
BLOCK
NUMBER
SYSTEM
BYTES
LENGTH
BYTE
HEADER
DATA (0-244 BYTES) CHECKSUM
0A 00 01 810180 0100 000000
01 04
Summary of Contents for VersaPort 2200
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