Product Manual — Doc. 8559B 4-Series™ Control Systems • 79
1. RS-422 transmit and receive are balanced signals that require two lines plus a ground in each direction. RXD+ and
TXD+ should idle high (going low at start of data transmission). RXD- and TXD- should idle low (going high at
start of data transmission). If necessary, RXD+/RXD- and TXD+/TXD- may be swapped to maintain correct
signal levels.
2. A ground terminal connection is recommended but not required.
Connect the Control Subnet
The AV4 has a dedicated Control Subnet that is used for communication between the control
system and Crestron Ethernet devices without interference from other traffic on the network.
CAUTION:Do not connect the CONTROL SUBNET ports to the LAN. The CONTROL SUBNET
ports must only be connected to Crestron Ethernet devices.
For more information on using the Control Subnet, refer to Control Subnet (on page185).
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