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KeyAT-4 Keyboard Port Adapter
5/19/2007
2
L3 Systems
Status Indicator
A red status indicator located on the side of the KeyAT indicates port activity. It turns
solid red when the attached keyboard port is being used. It blinks whenever the RS-232
port is active.
Serial Port Connector
The port is configured as a DCE device (it connects to a computer like a modem). On
the 9 pin DB-9S connector, it transmits data on pin 2 and receives data on pin 3. No
other RS-232 signal is required for it to operate.
Pin 6
Pin 9
Pin 1
Pin 5
Pin Signal
KB232 Function
1 DCD
RS-232 Output (High when Ready)
2 RX (Receive) from KB232
RS-232 Output
3 TX (Transmit) to KB232
RS-232 Input
4 DTR
RS-232 Input (Not Required)
5 Signal Ground
Ground
6 DSR
RS-232 Output (High when Ready)
7 RTS
Connected to RTS
8 CTS
Connected to CTS
9 RI / +5V Input
If K1 installed, connected to +5V
Warning: do not connect this unless
powering KeyAT from external source.