4.1.4. RS232, EPSO Protocol (9600, N, 8, 1)
When programmed to this protocol reader operates in transaction mode, i.e. responds only to
external commands received through the RS232 port. The software developer or system integrator
must incorporate EPSO protocol into the host device (usually PC or microcontroller) to
communicate with the reader.
In RS232 EPSO reader answers only those data packets which come from the host unit and are
addressed with reader’s ID number (address). The EPSO protocol is the set of communication
functions used to control the reader’s hardware (inputs, outputs, LED-s, buzzer, keypad and
reading of cards). The PRTxxEM configured for EPSO mode acts as pure “terminal”, it means that it
strictly follows commands received from the host unit.
4.1.5. RS232, PINs transmitted as separate digits (9600, N, 8, 1)
Once the card is read or key is pressed reader transmits card/PIN data on TXD line. Reader
transmits card code as 10 hex number while each pressed key is transmitted separately as 2 hex
coded ASCI characters.
4.1.6. RS232, PINs transmitted as whole numbers (9600, N, 8, 1 )
Once the card is read or [#] key is pressed then the reader transmits card/PIN data on TXD line.
([#] key is treated as PIN final digit and it is not transmitted). Reader transmits card code as 10
hex digit number and PIN code is transmitted as whole number max. 16-digit long.
The [*], [F1] and [F2] keys are transmitted in this format in the same way as PIN-s:
[*]: STX / 'A' / '#' / CR / LF / ETX
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