GB/T 26831.6-2015Society energy metering for reading system specification - Part 6: Local bus (English PDF)

1 Scope

This section GB/T 26831 requirements, a battery-powered single-copy reading device ( "master") and a single instrument or group of instruments (most

Communications read or copy copy local meter reading system, mostly 5) between ( "Local Bus") physical layer parameters. "Master" can temporarily or

Perseverance directly connected to the instrument (ie. local copy to read), but also the total length of the fixed-line or via a small bus connection meter (maximum cable

50m, namely. a local copy of a remote reading).

About instrument communication systems and remote meter reading copy of general statements, see GB/T 26831.1.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 26831.2-2012 Collecting Community energy metering system specification - Part 2. Physical layer and link layer

3 physical layer specifications

Local bus is a variant of the M-Bus bus. Its application is limited to small devices (in line with GB/T 26831.2-2012 Appendix E.6.1

The E-type Minibus device), and for the pure battery-powered device optimized master. Typically, the copy read by the frequency meter constraints. this

Bus does not support instruments to take power from the bus. Note that this instrument interfaces and comply with GB/T 26831.2-2012 the M-Bus master is not

Compatible. To facilitate instrument power management, master should be turned on bus power not exceeding 10s time before starting any communication instruments (ie.

Sent into the master reference state), see Table 2 in the "master label status before communication duration."

Note. Appendix A circuit diagram is a possible solution to achieve this interface.

The instrument has a local bus interface should meet the requirements of Table 1.

Table 1 meter requirements

Parameter Minimum Maximum

No damage to the instrument voltage > ± 50V -

Ground insulation > 1Mohm -

Meter mark state receives a voltage> ± (UAM-1V) < ± 15V

Meter space state receives a voltage 0V < (UAM-3V)

Send current meter mark state (IBM)

0.5mA = 1LUL (LUL. Local Bus unit load)

0mA < ± 0.5mA

The amount of change in the IAM for each LUL voltage (IAM. meter space state transmitter current)

- < ± 0.05mA/V […]