IQH3A IQ 3U Modular Enclosure
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Installation
Issue 2 Rev 2
Page 32
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2014 Snell Limited
3.15.1.4
RollNet RS-485 10-way DIN connector
RollNet RS-485 is also available on a 10-way DIN connector on the Gateway front edge. This
can be used to connect an active front panel to the Gateway for configuration purposes.
This connector normally drives the LED on the 3U frame front panel.
3.15.1.5
RS-422 or RS-232 Asynchronous Interface
This interface allows a PC running RollCall control software to be connected to the RollCall
network without a RollNet interface card. The PC is connected via an RS-232 or RS-422
serial port (often known as a COM port).
RS-422 allows longer cable runs and offers better immunity to electrical noise, but usually
requires an RS-422 to RS-232 converter to connect to a PC (Some specialist control PCs
support RS-422 directly). RS-232 allows direct connection to a standard PC serial (COM
port), but only supports shorter cable runs of up to 4 meters.
Example configuration:
A serial device attached to a single IQ rack has access to all devices on the RollCall network.
The serial port can also be used for third party connections into the system. This allows PCs
or any other serial device access to any of the units within the system. Please consult Snell
for details of the port binary protocol.
In addition to the rear serial port, the RCIF3U2C also has a front serial connector. The front
and rear connectors may be used simultaneously.
The serial port supports speeds up to 115.2 kbps. The RollCall PC software is limited to
57.6 kbps.
3.15.2 Ethernet Connection
This interface allows the 3U enclosure to be connected to a 10/100base T Ethernet network.
A PC can then connect to the 3U box via TCP/IP.
An Ethernet device connected to a single IQ rack has access to all devices on the RollCall
network. This interface can be used to connect a PC running the RollCall software.