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2.9
2.10
2.11
14
DTE connection
During commissioning, all settings to the modem board 1MRS119000 are made using a
DTE (terminal or Personal Computer running e.g. a terminal emulation program). The
DTE is to be connected to the 9-pin female connector Xn.2 via a standard RS 232 cable. If
you use your own cable, always check that the cable matches the pin configuration of the
modem board and DTE. Refer to the technical specifications for further details.
Connector Xn.2 has the same functionality as connector X2 on the rear side of the modem
board. Connector X2 is used for the data communication between the modem and the
microcontroller of the distribution automation equipment in which the modem is used.
The two serial interface connectors can only be used one at the time. The modem board
has a built-in serial interface using the data formats from: 1 start bit, 7 data bits, no parity
and 1 stop bit, up to: 1 start bit, 8 data bits, 1 parity and 1 stop bit.
The modem recognises the DTE data format (baud rate, number of data bits, etc.) auto-
matically after typing AT followed by a <CR> (carriage return), as long as the DTE data
formats are within the above mentioned range. Preferably, the DTE data formats should be
the same as the communication settings of the secondary substation equipment in which
the modem is used. The communication between the modem and the DTE is always half
duplex.
Mounting
The modem board is only delivered as part of ABB Transmit Oy's secondary substation
equipment and is therefore mounted by the factory. For altering jumper settings and for
service reasons, the modem board might have to be removed from the rack in which it is
normally mounted. The position of the modem board in the rack is described in the manu-
als of the concerned secondary substation equipment.
Remove or place the modem board only when the auxiliary supply voltage is turned off
and the telephone line is disconnected. Connect the telephone line after the board is in-
stalled in the cabinet.
As the modem and the equipment in which the modem is placed contain ESD sensitive
components, always take the necessary precautions to avoid electrostatic discharges before
removing or placing any of the printed circuit boards. Disregarding these precautions can
cause damage to internal electronics even in the long run.
Powering-up
Before applying the auxiliary voltage, check that the modem board is correctly mounted.
Refer to the previous section 'Mounting'.
The modem board is powered through the equipment it is placed in and does not need a
separate power supply.
As soon as the auxiliary voltage is applied, the modem performs a self-test, after which it is
initialized.
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