Rs485 - Systech Instruments EC900 series Operator's Instruction Manual

14.6 RS485

RS485 communications is available simultaneously with the USB connection. There are no user
selectable links that need to be changed within the instrument, all that needs to be done is to allocate
an address and connect the RS485 to the instrument. The connection details are below.
Data cables should be connected to the terminal strip on the rear panel refer to drawing no.
B900 076 at the end of this manual:
To communicate with the instrument an instrument address should precede the normal USB
command. Default address is 9 so sending #9'command' and the instrument will return the data, i.e.
#9? carriage return will return the oxygen reading.
If there is more than one instrument connected, the instrument ID should be different for each. To set
the address connect only one instrument to the RS485 and send "#9ID=x" where x = 0 to 9. It is also
possible to set the instrument address using USB.
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EC900 Series Operation Manual
Terminal Signal
A Data +
Data –
B
V4.7
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