Satec PM130 User Manual

8
Response
The normal response is the retransmission of the write request.
3.4 Function 16 - Write Multiple Registers
This request allows the user to write the contents of multiple contiguous registers to a single
data table where registers can be written.
Request
Instrument
Address
Function
(16)
Starting
Address
Word
Count
Byte
Count
1 byte 1 byte 2 bytes 2 bytes 1 byte
Data Word 1 ... ... ... Data Word N Error Check
2 bytes ... ... ... 2 bytes 2 bytes
Starting Address
Address of the first register to be written
Word Count
The number of contiguous words to be written
Byte Count
The number of bytes to be written
Response
Instrument
Address
Function
(16)
Starting
Address
Word
Count
Error
Check
1 byte 1 byte 2 bytes 1 word 2 bytes
3.5 Function 08 - Loop-back Communications Test
The purpose of this request is to check the communications link between the specified
instrument and PC.
Request
Instrument
Address
Function
(08)
Diagnostic
Code (0)
Data Error
Check
1 byte 1 byte 2 bytes 2 bytes 2 bytes
Diagnostic Code
Designates action to be taken in Loop-back test. The protocol
supports only Diagnostic Code 0 - return query data.
Data
Query data. The data passed in this field will be returned to the
master through the instrument. The entire message returned will
be identical to the message transmitted by the master, field-per-
field.
Response
Instrument
Address
Function
(08)
Diagnostic
Code (0)
Data Error
Check
1 byte 1 byte 2 bytes 2 bytes 2 bytes
The normal response is the re-transmission of a test message.

Satec PM130 Specifications

General

Frequency Measurement Range	45 to 65 Hz
Power Supply	85-265V AC/DC, 100-300V DC
Display	LCD
Communication	RS485
Digital Inputs	2
Digital Outputs	2
Protocols	Modbus RTU
Accuracy	0.2% of reading
Power Accuracy	0.5%