SERIAL INTERFACE SPECIFICATION
89
COMMON ATTRIBUTES
This section describes requirements common to the reader and the host.
Note:
SIF is a half-duplex communication protocol. To maintain proper
communication, the requirements in this section must be met.
All SIF systems have four signal lines. Two are for handshaking and two are for
transmitting and receiving serial data.
Many communications packages do not properly use the handshaking lines for half
duplex communications. If using a PC communications package such as Windows
Terminal, verify that the terminal RTS line (CTS reader's line) is active or disconnect
the reader RTS/CTS lines. In this case, connect the PC (Host) RTS/CTS lines
together.
The
lists the reader’s signal lines, and the
lists the host’s signal lines.
Reader Signal Lines Table
TXD
Serial data transmit output. Drives the serial data receive input of the host.
RXD
Serial data receive input. Driven by the serial data transmit output of the
host.
RTS
Request-to-send handshaking line (output).
CTS
Clear-to-send handshaking line (input).
Содержание Dragon D151
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