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P a g e
10
43
RS485-1 A
Modbus master non-inverting signal for RS485 port 1
44
RS485-1 B
Modbus master inverting signal for RS485 port 1
45
RS485-1
GND
Signal ground
11*
46
RS485-2 A
Modbus slave non-inverting signal for RS485 port 1
47
RS485-2 B
Modbus slave inverting signal for RS485 port 1
48
RS485-2
GND
Signal ground
12*
49
1-WIRE
1-wire bus for accessories such as ID-button/temperature sensors
50
1-WIRE LED
1-wire ID-button LED
51
GND
Signal ground
13
52
DC OUT
+5V / 300mA DC-OUT for external equipment (tied together internally)
53
DC OUT
+5V / 300mA DC-OUT for external equipment (tied together internally)
54
GND
Signal ground
14**
55
XBAT+
External battery positive (+) connection
56
GND
External battery negative (-) connection
57
XBAT NTC
External battery NTC temperature sensor connection
* not yet implemented
**connector not supplied with the device.
Digital Inputs with S0
The eight digital inputs are all low-pass filtered (105 kHz) and transient-protected. The digital inputs
are divided in two groups. Digital input X1-X4 can be configured as S0 input (IEC62053-31, Class A)
by supplying the S0 circuit through the S0 V+ and digital input GND 1 terminal pins and enabling
the S0 interface through the user application. When not supplied the inputs act as normal digital
inputs. The digital inputs X5-X8 are normal digital inputs. To activate the normal digital inputs,
connect a positive voltage between the corresponding input (X) and digital input GND on the
corresponding terminal connector group.
The X1 can act as wakeup input sources.
S0 compliant inputs (IEC62053-31, Class A compatible)
In S0 configuration the relevant FMGuard
input will act as a ‘pulse input device’, and a
current is supplied into the input connector so that a simple switch between digital input
GND 1 and the appropriate input will activate it. This is used in most electricity metering
equipment.
Note:
The S0 auxiliary supply input located on the terminal group 4 must be supplied with a minimum of
16 VDC for the S0 mode to work according to IEC62053-31, Class A. S0 must also be enabled from
the application in order to work as an S0 compliant input. Digital input GND 1 and digital input
GND 2 are isolated and not tied together internally.
