senva EM-RS485, Руководство по протоколу, Страница: 8 / 52

EM-RS485 Modbus Protocol Guide Page 8 of 52 154-0023-0B
Holding Registers
The EM-RS485 supports the following Modbus functions:
•
0x03 Read Holding Registers
• 0x06 Write Single Register
• 0x10 Write Multiple Registers
In this document, Modbus addresses (beginning with “R”) represent raw protocol addresses. Some Modbus
conventions offset protocol addresses to form a register ID (e.g. 40001, Modicon notation). Refer to the
relevant controller documentation to determine any required programming offset for each installation.
Constructed registers (see Data Types ) span multiple Modbus address. The notation RXX/YY specifies a pair
of aligned registers. The notation RXX-YY specifies a range of consecutive registers, inclusive.
Unless otherwise specified, changes to RS485 parameters are effective after the response (i.e. a client must
maintain the original parameters for the remainder of the current transaction).
System Configuration
R102 Reset Reason UINT16 R
Returns a reason determined at the time of the last reset:
1. Configuration Reset (see R190 )
2. (reserved)
3. Power Loss
4. (reserved)
5. Hardware Watchdog
R103 Reset Count UINT16 R/NV
Returns a lifetime count of firmware resets for any reason. The meter maintains this count in a
protected section of non-volatile memory unaffected by
Configuration Reset (see R190 ).
At each reset, the meter restores accumulated energy, demand statistics, and pulse input counts
from non-volatile memory. However, all the analog statistics reset, plus the
Up Time (see R104 ),
Energy Timestamp (see R174 ), and pulse input Elapsed Active Time (see R212 ).
R104/05 Up Time UINT32 R
Returns the time since the last meter reset, in seconds. To determine the cause, read R102 .
R111 Identify Meter BOOL R/W
Sets the LED status interface into a visually identifiable mode:
0. Inactive
1. Active
When set to Active , all status LEDs (see Installation Guide ) begin slowly blinking green together.
This pattern is distinct from any other interface pattern the meter may display during normal
operation. The LEDs will remain in identify mode until the reset to
Inactive or the Setup Button is
pressed.
This feature may be useful if several meters are connected on a single network and the association
between discovered device IDs and physical meters is uncertain.
Default: Inactive (normal LEDs)