Extron Electronics MTP R 15HD RSA D User Guide - Manual (Page 18)

MTP R 15HD RSA D • Installation and Operation 14
RS-232 function
When the audio/RS-232 portion of the TP link is RS-232, it is
either unidirectional or bidirectional, selectable by a DIP switch.
N By default, the RS-232 portion of the TP link is
unidirectional only from the transmitter to the receiver.
If there is only one receiver in the system, you can set it
to be bidirectional. When bidirectional is selected, the
receiver can receive commands from the transmitter as
well as pass RS-232 responses back to the transmitter.
See the BI-RS232 DIP switch description (page 9) to
allow bidirectional RS-232 communications.
The RS-232 link:
• Supports software flow control (XON, XOFF).
N Hardware flow control is not supported.
• Supports full duplex and half duplex operation.
• Supports any baud rate (up to 38,400), data bits, parity,
stop bits, and data format without configuration.
N Higher rates are possible, but performance varies
depending on baud rate and TP cable length.
Audio/RS-232 cable termination
Receive (Rx)
Transmit (Tx)
Ground ( )
Bidirectional
Mono Audio Output
RS-232 Output
Tip
Ring
Sleeve
Rx Tx
RS-232
Device
Ground ( )
Receive (Rx)
Transmit (Tx)
Rx Tx
Do not tin the wires!
Figure 7 — Captive screw audio/RS-232
connector wiring
C The length of the exposed (stripped) portion of the
copper wires is important. The ideal length is
3/16 inches (5 mm). Longer bare wires can short
together. Shorter bare wires are not as secure in the
direct insertion connectors and could be pulled out.
Receiver Considerations
N Each transmitter in a system requires a separate receiver.