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   Author  Topic: bluetooth serial communication  (Read 161 times)
Nick Kostelidis
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bluetooth serial communication
« on: Dec 10th, 2018, 5:28pm »
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Hello.
Lets we suppose that we have a PsionII connected with a surveying instrument via a comms link cable. Is  there any way to cut the cable and on the one edge connect a bluetooth transmiter and  
on the other edge connect a bluetooth receiver in order to have a wireless serial communication?
Mikesan
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Re: bluetooth serial communication
« Reply #1 on: Dec 10th, 2018, 8:49pm »
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In practical terms, unless you understand the electronics and all of the relevant protocols, no. A certain person on this forum does come out with some pretty amazing electronics projects like Comms Links and large volume Datapaks and stuff, from time to time, so there are people about who can do it.
 
Bluetooth is a vastly more advanced communications technology than 'good ole' RS232! It's literally like comparing a smartphone to two cans with a piece of string between them. RS232 is incredibly S-L-O-W by comparison to Bluetooth.
 
That said, you might be able to find a converter on AliBaba or something, but you would be looking at, "RS232 to Bluetooth converter" and it is not as simple as connecting a few wires!
 
https://www.ebay.co.uk/itm/Wireless-Bluetooth-JY-MCU-HC-06-RS232-Serial- Transceiver-Module-Arduino-ex-hc-05-/262601335477
[editor splits URL - copy & paste...]
 
That was just a quick search. The one above sends data over Bluetooth, but when they say, 'data' it means that you'll still need your MAXRS232 chip for RS232 level conversion and design a small circuit around it to interface to the converter. Keep looking, you might find one that does it all for under $10!
« Last Edit: Dec 10th, 2018, 8:53pm by Mikesan »
Nick Kostelidis
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Re: bluetooth serial communication
« Reply #2 on: Dec 11th, 2018, 12:04pm »
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Thank you Mikesan.
I hope olivierg make something like that in the future.
olivierg
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Re: bluetooth serial communication
« Reply #3 on: Feb 1st, 2019, 11:01pm »
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Hi Nick,
 
You can disassemble an original comms' link and replace the cable with the bluetooth module by connecting:
TX to Pin 18 of HC244
RX to Pin 13 of HC244
and GND & VCC.  
(If you have a DB 25 version, you must jump DTR / DSR together).
 
After transfert, un-connect quickly, the BT module use 30mA, is many for 9V batterie (capacity is 400mA to 560mA (Lithium 1200mA)).
 
The USB version, send power to psion not to consume on the internal battery. With a bluetooth module if you have to connect an external power supply it loses interest.
 
Thanks
Olivier
« Last Edit: Feb 2nd, 2019, 12:21am by olivierg »
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