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8. Physically connecting to your RS232 device
8.1. Configuring the communications parameters.
The adapters do not have the ability to auto-detect the communications parameters (e.g. baud rate) so they must be
configured to match the data rate used in the application to which they are connected.
Please refer to section 4.2.3 above, for details on how to do this.
It is possible, if a little confusing, to “pair” two adapters and have them physically connected to RS232 devices
which use totally different communications parameters.
8.2. Physically connecting your device to adapter via the RS232 connector
The adapter is supplied with a 9-pin D type connector, Male (DTE) for the BL-819 and Female (DCE) for the BL-
830. The DTE (Data Terminal Equipment) configuration of the BL-819 has been chosen to allow for easy
connection to DCE (Data Communication Equipment) RS232 devices that would normally connect directly to the
RS232 port on a computer. Included is a convenient and appropriately wired gender changer that allows the
Adapter to behave as a DCE device (e.g. if you wish to connect it to your computer for configuration or to Bluetooth
enable the same).
Connector Pin-Outs for the BL-819 DTE are as follows.
As the RS232 standard allows for many different cable configurations,
your device may need an additional cable to work with the adapter,
such as a “cross-over” or “null-modem” cable. Please refer to your
device’s documentation for specific details.
Pin Signal Pin Signal Pin Signal
1 N/C 4 DTR – N/C 7 RTS
2 RxD 5 Ground 8 CTS
3 TxD 6 DSR – N/C 9 N/C
For the BL-830 and the BL-819 fitted with the supplied gender changer, the Pin-Outs are
The female connector is designed so that it can be plugged directly into
a PC’s motherboard COM port. If you are connecting it directly to a
different device you may need an additional cable, such as a “cross-
over” or “null-modem” cable. Please refer to your device’s
documentation for further details. *NB The ability to use Power on Pin 9
‘out of the box’ is only available for the BL-830. For the BL-819 to use
this method of powering a different gender changer to the one supplied
will be required, which has Pin 9 connected.
Pin Signal Pin Signal Pin Signal
1 N/C 4 DSR – N/C 7 CTS
2 TxD 5 Ground 8 RTS
3 RxD 6 DTR – N/C 9 Power on Pin 9*
Manual for BL-819 / 830 © Copyright Brainboxes Limited 2005 Page 32 of 41