Sending Commands to the IMY, Command String Examples

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.

COMMANDFUNCTIONS

Ttransmits the requested information specified by the identifier (A-I, K, and L)

Vchange 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.

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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*