L3 Systems KeyAT, Руководство пользователя

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KeyAT Keyboard Port Adapter
5/19/2007 22 L3 Systems
Serial Port Operation
The Serial Port operation is configured by the DIP switch for
baud rates of 1200, 2400, 4800 or 9600 baud. The
asynchronous character frame is configured for 1 start bit, 8
data bits, one stop bit. The port is configured as a DCE device
(it connects to a computer like a modem). On the 25 pin DB-
25S connector, it transmits data on pin 3 and receives data on
pin 2. No other RS-232 signal is required for it to operate.
Serial Port Connector
In single drop (not addressed) mode, pins 6 and 8 will always
be active. In multi-drop mode, they are only active when the
KeyAT is not transmitting.
Pin Signal Function
1 Chassis Gnd
2 TX to KeyAT RS232 Input
3 RX from KeyAT RS232 Output
4 RTS Connected to CTS
5 CTS Connected to RTS
6 DSR RS232 Output
7 Signal Gnd RS232 Output
8 DCD RS232 Output
20 DTR RS232 Input
14 Rx/Tx+ RS485 Input / Output
16 Rx/Tx- RS485 Input / Output