NV10 Operations Manual – GA333-3
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© Copyright Innovative Technology Limited 2005
7.4: Simple Serial Input/Output
Existing Smiley® NV4 users may already be using the serial input/output facility. The NV10 Validator
also supports this system. However this interface is not recommended for new designs, the Smiley
®
Secure Protocol SSP interface is recommended.
Caution:
•
The
NV10
does not
support the Simple serial data out only mode as available on NV4. It
only supports the serial data Input/Output mode.
•
The host machine does not echo messages back to the Validator.
•
The
NV10
does not
operate in true RS232 mode.
•
The NV10 will not enable in serial I/O mode if Inhibit 3 line is held low on power up
To use simple serial mode DIPswitches 3 & 4 must both be set up and the Simple Serial mode SIO
option of the interface firmware must be loaded into the NV10.
Commands are provided to fully control the operation of the validator. The notes to be accepted and
rejected can be set and a single escrow mode can be enabled. In simple serial mode single byte
commands are transmitted to the Validator, the Validator echoes each valid command it receives.
The serial I/O mode supports two baud rates; 300 baud when Inhibit 2 is pulled high or left floating at
power up and 9600 Baud rate when Inhibit 2 line is held low at power up. The data is formatted as
follows (see figure 6):
1-start bit - 8 data bits - 2 stop bits - 300 baud
Vend 1(pin 1)
idle
start bit
0 bit
1 bit
2 bit
3 bit
4 bit
5 bit
6 bit
7
stop
stop idle
3.3ms
0 0 1 0 1 0 0 0
=
20dec
Figure- 6 Typical Serial Output Transmission of the value 20 (decimal), Note Not Recognized
