Mercury 2+, Руководство пользователя

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2019r0 Page 78 of 82 Mercury 2+ Operator Terminal User Manual
Registers 19...20 : Wiegand Security Card Reading
A pair of Modbus registers is used to hold the Wiegand card
reading.
Up to 5 Wiegand card readings may be buffered waiting to be read.
If further Wiegand card readings are made without the buffer being
read, the subsequent data is lost.
The Modbus input registers are used together to hold the 32 bit
value read from the Wiegand card. The lower Modbus register of
the pair will contain the bits <31:16> and the higher order register
will hold the bits <15:0>.
Registers 21...35 : Composed Text Modbus Input
A set of 15 Modbus registers are used to hold the Composed Text
readings.
Up to 5 Composed Text readings may be buffered waiting to be
read. If further text is entered without the buffer being read, the
subsequent data is lost.
For each Modbus register, the high order (D8­D15) will hold the
left hand character ASCII value and the low order (D0­D7) will
hold the left hand character ASCII value. If the Composed Text is
less than 30 characters long, then the Modbus register "half"
following the last valid character will have the value 00
H
, as will
all the other Modbus registers in the rest of the register set.
Coils 1 to 5 : Digital Inputs (single bit reads)
5 off single bit Modbus inputs that reflect the digital input status of
the Mercury 2+.
The bits are as follows:­
Coil 1
Digital Input 1
Coil 2 Digital Input 2
Coil 3 Digital Input 3
Coil 4 Unused – always reads '0'
Coil 5 Same as Digital Input 1 (this is to emulate the old
Wiegand Card Present coil)