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3.6. Internal/ External reader Port: INT 21H
There are two readers can be connected to MR350 MKII --- Internal
Reader and External Reader. Internal reader is a build-in reader, it is
installed inside of MR350 MKII. External reader can be connected to either
scanner port or terminal block. For internal reader, if it cannected with
Magnetic stripe reader or Bar code slot reader, the system can automatically
set up the Internal reader type by detecting the first time swiped card type. If
the user use the default type, the Bar code slot reader. When he attempts to
swipe the magnetic card through the slot reader, the terminal will detect it
and change the slot reader type into Magnetic stripe reader automatically.
However, this automatically discriminating reader type feature will not keep
the first attempt data. The user must re-swipe again.
51 Enable/Disable External reader port
Entry Parameters: AH = 0x51
AL = 1 ;enable external port
0 ;disable external port
Returned Values: None
void TD_set_external(int status)
{
regs.h.ah = 0x51 ;
regs.h.al = (unsigned char)status;
int86(0x 21,®s,®s);
}
18 Set external slot reader (only available for Barcode and Magnetic
reader)
Entry Parameters: AH = 0x18
AL = 1 ;define as Bar code slot reader
0 ;define as Magnetic stripe reader
Returned Values: None
void TD_set_external_type(int status)
{
regs.h.ah = 0x18 ;
regs.h.al = (unsigned char)status;
int86(0x 21,®s,®s);
}