User manual

DPMS XPQ User Manual

CRC16 Hi: CRC high byte

CRC16 Lo: CRC low byte

1. Read Status of Relay (Function Code 01)

This function code is used to read status.

1=On, 0=Off;

There are 2 Relays. The Address of each Relay is Relay1=0000H and

Relay2=0001H.

The following query is to read Relay Status of meter number 17.

Query

Addr Fun relay start

reg hi

relay start

reg lo

relay #of

regs hi

relay #of

regs lo

CRC 16

11H 01H 00H 00H 00H 02H BFH 5BH

Table 5.4 Read the status of Relay1 and Relay2 Query Message

Response

The DPMS XPQ response includes the meter's address, function code,

quantity of data byte, the data, and error checking. An example response to read

the status of Relay1 and Relay2 is shown in Table 4.5. The status of Relay1 and

Relay2 is responding to the last 2 bits of the data.

Relay1: bit0; Relay2: bit1

Address Function code Byte count Data CRC high CRC low

11H 01H 01H 02H D4H 89H

Table 5.5 Relay status responds

The content of the data is:

7 6 5 4 3 2 1 0

0 0 0 0 0 0 1 0

MSB LSB

Relay1 = OFF (LSB ), Relay2=ON (Left to LSB )