Verilink Productivity 500 (34-00236) Product Manual - Manual (Page 70)

Page 70 500 TA V.25 bis Dialer Operation
DTE INTERFACE PINS
The function of some pins on the DTE port is different than in other synchro-
nous modes.
DTR Pin Operation
For the 500 TA to accept V.25 bis commands, the DTE must hold the DTR sig-
nal high. When configured for V.25 bis dialing, the DTR pin option setting
does not apply because the V.25 bis specification explicitly defines how the
dialer will respond to changes in DTR.
DCD Pin Operation
The default operation of the V.25 bis dialer asserts the DCD pin when DTR is
high (DCD follows DTR). Some devices may require DCD to be low until the
connection is established. For those devices, the 500 TA can be configured to
only raise DCD upon connection by setting the DCD pin option to NORMAL.
The DCD pin option setting of ON is the default for CCITT V.25 bis operation.
Refer to the Terminal Interface and Pin Options (
page 48 ).
CTS Pin Operation
The 500 TA asserts the CTS pin when DTR is high (CTS follows DTR), except
that CTS goes low during the connect sequence.
DSR Pin Operation
The 500 TA holds the DSR pin low until a connection is established.
Command Messages
The following V.25 bis commands are supported by the 500 TA:
Indication Messages
The following V.25 bis indications are supported by the 500 TA:
Command Description
CRN Dial Command
CIC Connect Incoming Calls
DIC Disregard Incoming Calls
Command Description
CNX Call Connect Indication
INC Incoming Call Indication