Appendix B - Network Terminal RS-232 Interface Protocol Format
B-4 P/N 8040375G001
C
HELIX TECHNOLOGY CORPORATION
-
TI CR
Y
OG
E
N
IC
S
The following is an example of a typical exchange:
Host Sends query to get back On-Board Module Version Information for
Pump #1
Checksum of Pump Address and Data Field
Bits 76543210
Sum of
50 01010000
30 00110000
31 00110001
40 01000000
Equals 11110001or Hex F1
Bits 7 & 6 aligned for
X0R 00000011
X0R result 11110010
Mask D5, D0 00110010
Addend ’0’ 00110000
Final Chk 01100010 Hex 62, ASCI ’b’
Slave sends reply of AP A2.01, meaning no error, Pump version A2.01.
Flag
Pump
Address
Data
Field
Checksum Terminator
ASCII [$] [P] [0] [1] [@] [b] [CR]
Hex [24] [50] [30] [31] [40] [62] [0D]
Flag
Data
Field
Checksum Terminator
ASCII [$ ] [A ] [P ] [ ] [A ] [2 ] [. ] [0 ] [1 ] [a ] [CR]
Hex [24] [41] [50] [20] [41] [32] [2E] [30] [31] [61] [0D]
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