INSTALLATION
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2.3.3 Auxiliary RS232 Interface
The auxiliary serial interface is used exclusively for RS232 point-to-point
connections.
The parameters relative to the aux interface (baud rate, data bits, etc.) as well as
particular communication modes such as LOCAL ECHO can be defined using the
WinHost utility program or "Host Mode Programming", installed from the diskette.
The following pins of the 25-pin connector are used to connect the RS232 auxiliary
interface:
Connector Name Function
25-Pin
20 RXAUX received data
21 TXAUX transmitted data
23 CTSAUX clear to send
24 RTSAUX request to send
7 SGND signal ground
7
SGND
SGND
TXD
RXAUX
20
RXD
TXAUX
21
DCD
RTSAUX
24
DTR
CTSAUX
23
USER INTERFACEDS2100 25-
in
Figure 13 - RS232 auxiliary interface connections using hardware handshaking
When the auxiliary interface is permanently connected as part of the system cabling,
it is recommended to connect the cable shield to earth ground.
The RTSAUX and CTSAUX signals control data transmission and synchronize the
connected devices. If the RTS/CTS handshaking protocol is enabled, the DS2100
activates the RTSAUX output to indicate a message is to be transmitted. The
receiving unit activates the CTSAUX input to enable the transmission.
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