Chapter 9 Appendix-Serial interface network use and communications protocoll
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W
Networking command
prefix of numeric string
address
*5
P
Prefix of return command
with check
&
Function sign of command
"add"
Communications commands
Note:
1. (cr)expresses carriage return. Its ASCII value is 0DH. (lf) expresses line feed.
Its ASCII value is 0AH.
2. "d" expresses 0-9 number. 0 value is expressed as +0.00.
"d" expresses 0-9 numbers. There is no decimal point in integral part before"E".
3. The status of the machine is expressed by 1-6 letters. See the error code
section for the meaning of the characters. For example, "R" and "IH".
4. Eight "dddddddd" expresses the electronic serial number of the machine. "t"
expresses the type of machine.
5. If there are multiple flowmeters in a data network then the basic commands
cannot be used alone. The prefix W must be added. Otherwise, multiple
flowmeters will answer simultaneously, which will cause chaos in the system.
Function prefix and function sign
Prefix P
The character P can be added before every basic command. It means
that the transferred data has CRC verification. The method of counting
the verified sum is achieved by binary system addition.
For example: Command DI+(CR) (the relative binary system data is 44H,
49H, 2BH, 0DH) transferred data is +10m3. (CR) (the relative
binary system data is 2BH, 31H, 32H, 33H, 34H, 35H, 36H, 37H, 45H,
2BH, 30H, 6DH, 33H, 20H, 0DH, 0AH). And command PDI+ (CR)
