Westermo IDW-90 AT - Manual (Page 33)

33 6620-3200
RTS: Request to send (flow control)
This serial status line is used for the flow control between the DTE device and the
IDW-90 (DCE).
0: No flowcontrol
3: Hardware flowcontrol RTS/CTS in the data mode
5: Hardware flowcontrol RTS/CTS in data mode and command mode
• If the DTE activates the flow control (RTS=off) the TA needs up to 3 characters
to stop the serial data stream to the DTE.
• If the connection will be cleared during an active flow control (RTS=off) the
received data will be sent to the DTE device when RTS becomes active. The
reported result code will also be sent with RTS on.
The control lines to indicate the active connection (DCD) and the "off hook"
state (DSR) will be changed without recognizing the current flow control state.
CTS: Clear to send (flow control)
This serial status line is used for the flow control between the TA (DCE) and the
DTE device.
0: No flowcontrol
3: Hardware flowcontrol RTS/CTS in the data mode
5: Hardware flowcontrol RTS/CTS in data mode and command mode
• If the TA activates the flow control (CTS=off) the TA will buffer up to 256 bytes
from the DTE device.
• If the connection will be cleared with DTR=off during an active flow control
CTS=off) the current connection will be cleared after a short timeout.
The received serial data from the DTE during the connection will be erased
after clearing the connection.
The control lines to indicate the active connection (DCD) and the "off hook"
state (DSR) will be changed without recognizing the current flow control state.
RI: Ring indicator
The serial status line RI becomes active during an incoming call request.
If the incoming call will be accepted or the call request ended the RI control circuit
goes off.