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T440 Users manual V021/B, © JED Microprocessors Pty Ltd Nov 17th 2008 Page 17
RS232 connections to Optoma Group 2: EP776, EP782 projector with D9
These use a 9-pin-D9 male on the proj, female on cable. Comms is at 9600 baud, 8 bits, no parity, 1 stop.
Function/Direction T440 “projector”
Connection
“Serial” Port Connector
Ground Ground 9-pin D-sub pin 5
Data from T440 to projector Tx 9-pin D-sub pin 2 (RXD)
Reply data from projector to T440 Rx 9-pin D-sub pin 3 (TXD)
Plus 9 volt CTS/DTR to projector n/c n/c
8
1 2 3 4 5
6 7 9
D-sub 9 female
solder side
After installation wiring of any projector to a T440, use a multimeter to check voltages of –9 on BOTH TX and RX pins
in any installation, as described in the troubleshooting part of this manual.