User manual

DPMS XPQ User Manual

3. Read Data (Function Code 03)

Query

This function allows the master to obtain the measurement results of the

meter.Table 5.8 is an example to read the 3 measured data (F, V1 and V2) from

slave device number 17, the data address of F is 0130H, V1 is 0131H and V2 is

0132H.

Addr Fun Data start

addr hi

Data start

addr lo

Data #of

regs hi

Data #of

regs lo

CRC 16

regs Hi

CRC 16

regs Lo

11H 03H 01H 30H 00H 03H 06H A8H

Table 5.8 Read F, V1, V2 Query Message

Response

The meter's response includes its address, function code, quantity of data

byte, data, and error checking. An example response to read F, V1 and V2

(F=1388H (50.00Hz), V1=03E7H (99.9V), V2=03E9H (100.1V) is shown in Table

4.9.

Addr Fun Byte

count

Data1

Data2

Data3

CRC16

11H 03H 06H 13H 88H 03H E7H 03H E9H 7FH 04H

Table 5.9 Read F, V1 and V2 Message

4. Control Relay (Function Code 05)

Query

This message forces a single Relay either on or off. Any Relay that exists

within the meter can be forced to be either status (on or off). The address of

Relays starts at 0000H (Relay1=0000H, Relay2=0001H). The data value FF00H

will set the relay on and the value 0000H will turn it off; all other values are

illegal and will not affect that relay.