Phytec miniMODUL-537, Руководство по оборудованию

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miniMODUL-537
4
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PHYTEC Meßtechnik GmbH 2001 L-006e_2
2.1 The Serial Interface
If an EPROM was installed by the manufacturer, usually all jumpers
are configured properly. In order to communicate with our Monitor-
program or Monitor-Basic, the connections of the RS-232 interface
A45, A47 with a terminal or PC/AT are required. Those programs
don’t use handshake-lines, since they are operating with XON/XOFF
protocol. Connect the RS-232-input A45 with the RS-232-output of
your PC/AT or terminal and the RS-232-output A47 with the
corresponding input of the terminal or PC/AT. The standard RS-232
connection is especially designated on the printing of the circuit board.
The arrows symbolize the flow of the signals. Don’t forget the
GND-connection for example to A63.
The standard baud rate is 9600 baud. The transmission format is
8 data bit, no parity, one start bit and one stop bit.
In case of malfunctioning, check if RxD and TxD are exchanged. With
a usual voltage meter you can measure, if at the TxD-connection a
negative voltage between –7 V ..-12 V against GND is found. RxD
has a voltage of 0 V against GND.
Please connect always TxD with RxD and RxD with TxD. If
sometimes the transmission is failing, the GND-line might be
connected in the wrong way.