Extron Electronics DVS 304 Series User Guide - Manual (Page 13)

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Remote (RS-232/contact closure) port — This 9-pin connector provides for two-
way RS-232 communication. See the “SIS Communication and Control” chapter for
information on how to install and use the control software and SIS commands.
The default protocol is 9600 baud, 1 stop bit, no parity, and no flow control.
The rear panel RS-232 9-pin D female connector has the following pin assignments:
Pin RS-232 Function Description
1 Input 1 Contact closure
2 Tx Transmit data
3 Rx Receive data
4 Input 2 Contact closure
5 Ground Signal ground
6 Input 3 Contact closure
7 Input 4 Contact closure
8 - No connection
9 - Reserved
Figure 7. RS-232 Pin-out
The Remote connector also provides a way to select an input using a remote contact
closure device. Contact closure control uses pins on the RS-232 connector that are not
used by the RS-232 interface (see preceding table).
To select a different input number using a contact closure device, short the pin for the
desired input number to logic ground (pin 5).
NOTE: If contact closure is not in use, pins 1, 4, 6, and 7 should have no
connection.
DVS 304 Series • Cabling 8