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Appendix D. S-Register List
61202.029L2-1 ISU 128 User Manual 109
S27 PPP MODE Determines type of PPP connection.
0= Single-link operation (default)
1= Multilink operation
2= Use compression
S30 DTE CTS Controls the operation of the DTE connector clear to send
(CTS) line.
0= Follows RTS
1= Force CTS
S31 DTE RTS Controls operation of the request to send (RTS) line.
0= 1 ms delay
17= 18 ms delay
S32 DTE DSR Controls the operation of the data set ready (DSR) signal on
the DTE connectors.
0= Force DSR on always
1= DSR off OOS + Test
2= DSR off Link Down
S33 DTE CD Controls the operation of the carrier detect (CD) line on the
DTE connectors.
0= Force CD on always
1= CD is active during a call (normal operation)
2= Off with LOCD
S34 DTE DTR Determines how the ISU 128 responds to changes in DTR.
This is a bit-mapped register.
0= Ignore DTR.
1= Force AT command mode when DTR is off
2= Dump incoming call when DTR is off
S35 DTE CONN Determines which is the current operating DTE connector.
0= RS-530 connector
1= V.35
2= EIA-232 connector
S-registers 36 through 38 require the optional V.34 modem P/N 1202029L3.