Apollo Intelligent Meter Series IMY Instrukcja Użytkownika Pobierz pdf (Strona 30)

SENDING COMMANDS TO THE IMY

When sending commands to the unit a command string must be

constructed. The command string may consist of command codes, value

identifiers, and numerical data. Below is a table outlining the codes the

indicator will recognize.

COMMAND FUNCTIONS

T transmits the requested information specified by the

identifier (A-I, K, and L)

V change a value specified by the identifier (C-F, K, and L)

N address a particular indicator in a multiple unit loop (0-99)

R reset a value specified by the identifier (B-D, G, H, I, and J)

P print per programmable print options (A-I)

VALUE IDENTIFIERS SERIAL MNEMONICS

A temperature INP

B integrator/totalizer TOT

C alarm #1 AL1

D alarm #2 AL2

E hysteresis #1 HS1

F hysteresis #2 HS2

G peak reading PEK

H valley reading VAL

I zero offset OFS

J offset input

K analog low ANL

L analog high ANH

Note: RJ - offset the input (re-zeros). When the input is offset (via front panel or

“RJ”) the amount is stored in the offset reading (I). Ex. When an offset is

performed, the display reads “5.0”, the offset value will be “-00005.0” (and

the display will show 0.0).

A command string is constructed by using the above commands and

identifiers along with any data values that are required. The indicator will

accept “+” or “-” in front of the data value. Numbers without “+” are

understood to be positive. Leading zeros can be eliminated and both lower

and upper case characters are accepted. The address command is used to

allow a command to be directed to a specific unit on the loop. If the indicator

is assigned an address of “0”, transmission of the address command is not

required. This is done where only one indicator is in the loop.

The command string is constructed in a specific logical sequence. The

indicator will reject command strings that do not conform. Only one

operation can be performed per command string. Below is a description of

how to construct a command string.

1. If the indicator has an address other than zero, the first two characters of the

string must consist of the address command (N) followed by the unit

address number (0-99). If the indicator has an address of 0, the address

command is optional.

2. The next two characters in the string are the actual command the indicator

must perform and the identifier on which it operates. Command P-print,

Value I-zero offset and J-offset input, have implied operators and need no

additional characters.

3. If the change value command is being used (V), the next characters in the

string after the value identifier, are the numerical data. When sending

numerical data, such as change an alarm value, the correct number of digits

to the right, must be included. As an example, to change an alarm value

from 150.2 to 50.0. Sending 50 would cause the indicator to see 5.0 and

change the alarm value accordingly.

4. All commands must be terminated by an asterisk(*). The indicator will not

respond to any other code. Carriage return and line feed are not valid

terminators and should be suppressed with the character “;”, if using a

BASIC print statement (ex. Print “N9TA*”;).

COMMAND STRING EXAMPLES

Indicator with address 3, transmit temperature reading.

N3TA*

Indicator with address 0, change alarm #1 to 150.

VC150*

Indicator with address 1, reset totalizer.

N1RB*

Indicator with address 99, print the print options.

N99P*

Indicator with address 0, zero the offset value.

RI*

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