Relay MR005DL User Manual page 5

RS232 interface:
The M-Bus can be accessed by an RS232C interface. A PC should be connected to the right
DB9 socket or a modem to the left DB9 plug. Only one of these connectors can be used
simultaneously. You can attach a 1:1 serial cable to PC or the cable which was delivered with
your modem to the modem. The modem must be configured before it is connected (see
addendum: "Modem configuration").
Pinning of DB9 connectors:
Pin Socket
2 RXD
3 TXD
4 -
5 GND
7 RTS
8 CTS
Pin 1, 6 and 9 are not connected
Simultaneous use of interfaces:
In case of a local readout using the keyboard of the remote display or during an automatic
readout the RS232 interfaces do not have access to the M-Bus. These functions can produce
temporary disturbances in communication. You should also know that the datalogger performs
no automatic readout of meter data during the operation by keyboard or serial interface.
Hints for installation:
• Write down the individual ID no. of the meters in the flats / real estates
• Configure the meters or pulse adaptors
• Configure the M-Bus Display / Datalogger (using keyboard or with the service software
FService on a Laptop or by Modem)
• Log in with the PasscodeB (predefined to: 00001767)
• Setup baud rates, search mode .. in the menu „Display config."
• Start search for installed meters with „List of slaves - AutomaticSearch"
• Check the list of slaves for missing meters, you can add missing slaves manually if it is
necessary
• Change the predefined passcodes (at least passcode B)
User Manual MR005FA+DL / MR006FA+DL ·04/2018 · VERSION 1.4
Plug Usage socket
TXD Transmit to PC
RXD Receive from PC
DTR Unused
GND Ground potential
CTS Handshake unused
RTS Always active
MR005FA+DL / MR006FA+DL
Usage plug
Receive from modem
Transmit to modem
Always active
Ground potential
Always active
Handshake unused
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