Manual for BL-819, BL-830, BL-875
V6.1
© Copyright Brainboxes Ltd Page 30 of 40
Physically connecting to your RS-232 device
1.15. 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 RS-232 devices which use
totally different communications parameters.
1.16. Physically connecting your device to adapter via the RS-232 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) RS-232 devices that would normally connect directly to the RS-232 port on a computer.
Connector Pin-Outs for the BL-819 DTE are as follows:
As the RS-232 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 provided 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.
Pin Signal Pin Signal Pin Signal
2 TxD 5 Ground 8 RTS
3 RxD 6 DTR – N/C 9 Power on Pin 9*
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