12
6.3.1. RS-232 Control (DB-9) Connection
To eliminate the need to make crossover or null modem cables, the RS-232 pinouts can be
configured for DCE or DTE. Set switch 2 to DCE if the connected device is DCE, and to DTE if
the connected device is DTE.
Typically the control system will be DTE and the controlled device will be DCE, however,
devices may vary. Refer to the manual for the connected devices for proper pinout
configuration.
1
2 3
4
ON
1
ON
2
3
1
2 3
4
ON
1
ON
2
3
PIN FUNCTION
2
RxD (Data Receive)
3
TxD (Data Transmit)
5
GND
PIN FUNCTION
2
TxD (Data Transmit)
3
RxD (Data Receive)
5
GND
2
3
5
FIGURE 10: RS-232 Modes and Connections
6.3.2. RS-232 Operation Mode / Firmware Update Operation
The RS-232 connection can also be used for firmware updates in addition to sending RS-232
signals. The DTE/DCE switch is used to set the RS-232 Mode.
Note:
The SERVICE/LINK switch must set to LINK during normal RS-232 passthrough
operation.
To perform firmware updates, the DIP switches must be set to DTE and SERVICE. Detailed
instructions and updated firmware will be posted to www.snapav.com as they are released.
Note:
The DIP switch should be set to LINK during normal operation.
FIGURE 11: Firmware Update settings
Transmitter
Receiver
1
2 3
4
ON
1
ON
2
3
DTE Mode
RS-232 DB-9 Pinouts
DCE Mode
Transmitter
Receiver