User's Manual

NXC-COM2 Dual COM Port Control Card
8
NetLinx Cardframe, Control Cards, and NetModules - Operation Reference Guide
NXC-COM2 Send_Commands (Cont.)
Command Description
HSON Enable RTS (ready-to-send) and CTS (clear-to-send) hardware handshaking.
Syntax:
SEND_COMMAND <DEV>,"'HSON'"
Example:
SEND_COMMAND RS232_1,"'HSON'"
Enables hardware handshaking on the RS232_1 device.
RXCLR Clear all characters in the receive buffer waiting to be sent to the Master.
Syntax:
SEND_COMMAND <DEV>,"'RXCLR'"
Example:
SEND_COMMAND RS232_1,"'RXCLR'"
Clears all characters in the receive buffer waiting to be sent to the Master.
RXOFF Disable the transmission of incoming received characters to the Master (default).
Syntax:
SEND_COMMAND <DEV>,"'RXOFF'"
Example:
SEND_COMMAND RS232_1,"'RXOFF'"
Disable the transmission of incoming received characters to the Master (default).
RXON Enables sending incoming received characters to the Master. This command is automatically sent by the
Master when a 'CREATE_BUFFER' program instruction is executed.
Syntax:
SEND_COMMAND <DEV>,"'RXON'"
Example:
SEND_COMMAND RS232_1,"'RXON'"
Start transmitting received characters to the Master (default).
SET BAUD Set the RS-232/422/485 port's communication parameters.
Syntax:
SEND_COMMAND <DEV>,"'SET BAUD <baud>,<parity>,<data>,<stop> [485 <Enable|Disable>]'"
Variables:
Baud: baud rates are: 230400, 115200, 76800, 57600, 38400, 19200, 9600, 4800, 2400, 1200, 600,
300, 150.
Parity: N (none), O (odd), E (even), M (mark), S (space)
Data: 7 or 8 data bits
Stop: 1 or 2 stop bits
485 Disable: Disables RS-485 mode and enables RS-232/422
485 Enable: Enables RS-485 mode and disables RS-234/422
Note: The only valid 9 bit combination is (baud),N,9,1.
Example:
SEND_COMMAND SOMEDEVICE_1,"'SET BAUD 115200,N,8,1, 485 ENABLE'"
Sets the SOMEDEVICE port's communication parameters to 115,200 baud, no parity, 8 data bits, 1 stop
bit, and enables RS-485 mode.