Multiple keyboards on an rs485 network, Terminating/biasing the rs485 network, Biasing the network – American Dynamics ControlCenter ADCC0200 User Manual
Page 22: Multiple keyboards, Terminating the network
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ADCC0200 and ADCC0300
Multiple Keyboards on an RS485 Network
A maximum of 16 devices may be connected when working in RS485 mode. A maximum
of eight keyboards can be assigned to the system.
For correct connection of multiple keyboards to an MegaPower LT, please see the
MegaPower LT Installation and Operation Handbook.
Terminating/Biasing the RS485 Network
The keyboard has built in RS485 network termination and/or biasing. For most small to
medium sized installations, it should not be necessary to change the switches from their
default settings. Only for large installations should your network require biasing and/or
terminating. The switches are shown below for your reference. The default setting for
switches 1, 2 and 3 is OFF (UP). Switch 4 is not used.
*Default setting
Network setting
Switch 1
Switch 2
Biased
ON
ON
Not Biased*
OFF*
OFF*
Network setting
Switch 3
Terminated
ON
Not Terminated*
OFF*
*Default setting