EM6100 Handheld Portable Ultrasonic Flowmeter Ver.8.08
Flomotion
Systems,
Inc.
EM6100
40
The IDN is a single byte value,
ranging 00-255.
P
Prefix before any command
&
Command connector to make a
longer command by combining up to
6 commands
Notes * CR stands for Carriage Return and LF for Line Feed.
** ‘d’ stands for the 0~9 digit numbers.
*** @ stands for the key value, e.g., 30H for the ‘0’ key.
§6.3 Protocol Prefix Usage
(1)
Prefix P
The prefix P can be added before any command in the above table to have the returning data followed
with two bytes of CRC check sum, which is the adding sum of the original character string.
Take the DI+(CR) command as an example. Assume that DI+(CR) would return
+10m3(CR)(LF)( the string in hexadecimal is 2BH, 31H, 32H, 33H, 34H, 35H, 36H, 37H,
45H, 2BH, 30H, 6DH, 33H, 20H, 0DH, 0AH), then PDI(CR) would return
+10m3!F7(CR)(LF). ‘!’ acts as the starter of check sum which is yielded by adding up the
string 2BH, 31H, 32H, 33H, 34H, 35H, 36H, 37H, 45H, 2BH, 30H, 6DH, 33H, 20H.
Please note that there will be SPACES (20H) before ‘!’.
(2)
Prefix W
The prefix W should be used in the network environment. The usage format is W + digit string which
stands for the IDN + basic command.
The digit string should have a value between 0 and 65534 except 13(0DH), 10 (0AH), 42(2AH,*),
38(26H, &).
For example, if the IDN=12345 instrument is addressed and returning the velocity of that instrument is
requested, the command will be W12345DV(CR).
(3)
Prefix N
The prefix N is a single byte IDN network prefix, not recommended in a new design. It is reserved only
