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IQH3B/IQH3BQ
User Manual
RollNet RS-485 Differential Interface
Sections of the coaxial network can be joined using the RS-485 bus. The RS-485 connections
are limited to shorter distances but are multi-drop allowing a rich combination of network
configurations. The combined total number of units across the coaxial network and the RS-485
bus is still 255 nodes and the total network length can be up to 1500m.
The maximum number of hub transitions between any number of nodes on a single local area
network is 4.
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:
3U Box
3U Box
1U Box
75 Ohm Network
Front Panel
75 Ohm
Terminator
75 Ohm
Terminator
Содержание grass valley IQH3B Series
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