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2.4.6
RS-485 Auto Flow & RS-422 Master/Slave Modes
You can set the "Auto Flow Control" mode of RS-485 or "Master/Slave" mode of RS-
422 by using the SW3 DIP switch for COM1, COM2. Please also refer to Table 2.9 for
the COM port mapping with the DIP.
In RS-485, if the switch is set to "Off", the driver automatically senses the direction of
the data flow and switches the direction of transmission. No handshaking is neces-
sary.
In RS-422, if DIP switch is set to "On," the driver is always enabled, and always in
high or low status. Please refer below for the default setting.
Table 2.12: SW3 DIP Setting
SW3 Status
ON
OFF (Default)
2.4.7
Redundant RS-422 Matter
In the occasion that UNO-4673A/4683 series RS-422 ports need to act as multi-mas-
ter in parallel with other RS-422 master ports. Because of the auto detection function,
the TX port will also receive data from other RS-422 master. To avoid this situation in
this kind of application, user can use SW5and SW7 to turn it off, then no data will be
received from TX port. Please refer to the Table 2.11 for the COM port mapping and
refer to Figure 2.3 for the location.
Table 2.13: Mapping table of switches for COM port
COM port
COM1
COM2
2.5
LAN: Ethernet Connector
The UNO-4673A/4683 series is equipped with 2 Intel 82574L Gigabit Ethernet Con-
troller which are compliant with IEEE802.3 1000Base-T, 100Base-TX and 10Base-T
(802.3, 802.3u and 802.3ab). And it is also equipped with 4 Realtek RTL8100CL Net-
work controllers which are compliant with IEEE 802.3u 10/ 100Base-T CSMA/CD
standards.
The Ethernet port provides a standard RJ-45 jack on board, and LED indicators on
the front side to show its Link and Active status.
Please note these LAN controllers all use PCI resource, the bandwidth or throughput
may be restricted by the PCI bandwidth.
2.6
USB Ports
The UNO-4673A/4683 series provides six USB interface connectors, which provide
complete Plug & Play and hot swapping for up to 127 external devices.
The USB interface complies with USB UHCI, Rev. 2.0 compliant. The USB interface
can be disabled in the system BIOS setup.
UNO-4673A/4683 series provides 2 USB port on the front panel, and 3 USB port on
the rear panel. It also provides 1 USB port inside the chassis for USB dongle key.
Description
RS-422: Master mode
RS-485: N/A
RS-422: Slave mode
RS-485: Auto flow control
Switches
Status
SW5
ON: Normal (default)
OFF: RS-422 multi-master
SW7
17
UNO-4673A/4683 Series User Manual
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