DS6500
16
2
Main Interface
The main serial interface is compatible with the following electrical standards:
RS232
RS485 full-duplex
RS485 half-duplex
20 mA current loop
The 20 mA Current Loop interface is available if the optional INT-60 accessory is installed.
This accessory interface replaces the RS232/RS485 selections.
The main serial interface type and its relative parameters (baud rate, data bits, etc.) are
selected via software using the Genius™ utility program. For more details refer to the
section "Main Serial Port" in the Genius™ Help On Line.
Details regarding the connections and use of the main interface selection are given in the
next paragraphs.
RS232 Interface
The main serial interface is used for communication with the Host computer and allows both
transmission of code data and configuring the reader.
The following pins of the 25-pin and 26-pin connector are used for RS232 interface
connection depending on the reader model:
Pin Name
Function
2 TX
Transmit
3 RX
Receive
4
RTS
Request to send
5
CTS
Clear to send
7
GND-ISO
Main signal ground
The RTS and CTS signals control data transmission and synchronize the connected devices.
If the RTS/CTS hardware protocol is enabled, the DS6500 activates the RTS output to
indicate a message can be transmitted. The receiving unit must activate the CTS input to
enable the transmission.
DS6500
7
GND-ISO
GND
USER INTERFACE
RTS
4
CTS
5
RX
3
RXD
TX
2
TXD
1
Shield
Earth
Ground
Figure 25 - RS232 Connections
