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BOCA PRO16 Reference Guide
Appendix C
RS-232 SIGNALS
This appendix describes each of the signals supported on the modem’s
RS-232 socket.
FPin assignments are only applicable to products with a 25-pin DB-25
connector. Refer to your Product Guide for information regarding the
pin assignments for your product.
Transmit Data (TxD) - Pin 2
The computer transmits data to the modem via this pin.
Receive Data (RxD) - Pin 3
The computer receives data from the modem via this pin.
Request To Send (RTS) - Pin 4
This signal indicates to the modem whether the computer is ready
to begin sending data to it. When RTS/CTS flow control is
enabled, the RTS signal is used by the computer to pause the
transmission of data from the modem to it. If RTS/CTS flow control
is not selected, the RTS signal is ignored when the modem is in
asynchronous mode or local command state.
Clear To Send (CTS) - Pin 5
This signal indicates to the computer the modem is ready to begin
receiving data from it. When RTS/CTS flow control is enabled, the
CTS signal is used by the modem to pause the transmission of data
from the computer to it. If RTS/CTS flow control is not selected CTS
will always be asserted when asynchronous operation is selected.
With synchronous mode selected CTS will be lowered when the
modem is on line until such time as DSR and DCD are asserted. CTS
will always be asserted in local command state.
Data Set Ready (DSR) - Pin 6
This signal indicates to the computer that the modem is ready to
begin communications. In asynchronous mode, this signal will be
asserted whenever the modem is switched on and is not performing
a test. In synchronous mode, the DSR will only be asserted when the
modem is off hook. The &S command lets you control the state of
the DSR signal.
Signal Ground (SG) - Pin 7
Ground for all signals on the RS-232 socket.
Appendices
Appendices
pro16ref.pm6 6/14/96, 2:40 PM217
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