INTEGRA Metering AMBUS Port 20 Instructions De Montage page 5

Description
AMBUS ® Port 20 is a level converter (master) for remote feeding and remote reading of up to 20 slaves. It is resistant to sustained short
circuit. It's very flexible in power supply and has a RS-232C and an optical interface
LED Indicators
On green
Slave yellow
Short red
RS232 interface
For data request and utilization of the respond data, a control computer is necessary. Therefore an RS-232 interface is available. The RXD,
TXD and GND lines are run to screw terminals and to the D-SUB connector in front. Echos are suppressed. There is no isolation between
M-bus, power supply and RS-232. If electrical isolation is needed, use the optical interface.
RS232-Klemmen
Rx Data line (PC receive line)
Tx Data line (PC transmission line)
⊥ ⊥
Interface reference voltage
Belegung der DB9-Buchse
Pin1 DCD
Pin2 RXD
Pin3 TXD
Pin4 DTR
Pin5 GND
Pin6 DSR
Pin7 RTS
Pin8 CTS
Pin9
Optical interface
To relieve the installed control computer, hand-held units are often used to read the M-Bus network. Therefore the AMBUS" Port 20 offers
convenient optical readout with optical head. Light from external sources has been suppressed to avoid interference. On the optical inter-
face only transmission speeds of 300...2'400 Baud can be guaranteed.
M-Bus Specifications
Number of unit loads
Bus quiescent current
Resistance to short circuit
Overcurrent interruption
Bus quiescent voltage
Internal resistance
Transmission speed
®
AMBUS Port 20
Supply voltage is applied
Slave transmitting
Overcurrent (short-circuit)
linked with pin4
Data line (PC receive line)
Data line (PC transmission line)
linked with pin1
Interface reference voltage
High level (Detection of Port 20)
Handshake line, linked with Pin8
Handshake line, linked with Pin7
not assigned
0...20
0...30 mA
permanent
50...70 mA (min. 50ms)
30.5V + 5%
< 100 Ω
300...9'600 Baud
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