Manual EDM 180
Revision 1.0 29.03.2010 Page 48/61
8 RS-232 interface
8.1 RS-232 interface
The serial interface exists out of a 9 pin socket: one is located on the rear side of the device (labelled with
„RS232 to PC“). Via this interface the communication between the PC and the device takes place. The
second one is behind the front door and intended for the service. Above the socket is an LED which
shines green at an established connection. Red signalizes the data transfer. Only use the GRIMM data
cable RS-232 with the catalogue number 1.143E. The service socket is treated prior-ranking when the
terminal program sets the handshake lines (CTS or DSR) to high.
.
8.2 Transmission protocol
The baud rate for normal data transmission is 9.6 kBd. Eight data bits without parity and one stop bit
are being used. The software protocol XON/XOFF is being supported. At the Quick Data transmission
additionally the CTS-line is being requested. Here the baud rate can be up to 57.6 kBd. If no CTS line is
being connected, the interface will be regarded as free.
8.3 RS-232 commands
The following commands can be sent via the RS-232 interface to the airborne dust monitor. The device
confirms the receiving by an echo. The commands can exist out of capital or lower case letters. Numeric
values, which can only be sent within the stand-by mode, have to be concluded by the key Carriage
Return. For testing you can use every terminal program which supports the XON/XOFF-protocol (e.g.
HyperTerminal). The according settings of the interface parameters have to be done previously. The
function keys can be backed up with commands for the dust monitor.
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