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$19/S20
Not used
4. Registers _
$21
Bit mapped options
Binary code:
00xx xx00
Default
20 hex
Bit 0-1 | Not used
0
Bit2
{RTS/CTS function
0|(&RO)
| When the modem is on-hook,
CTS is always ON. CTS goes off
(Only in Synchronous
as soon as the modem goes off-
mode.)
hook and remains OFF until the
handshake is completed.
When
(See &R-command.)
the modem detecis an OFF to
ON transition on RTS, CTS will
go ON after a delay determined
by regisler S26. If the modem
detects ON to OFF on RTS, CTS
will go OFF immediately.
1|(&R1) | When the modem is on-hook,
CTS is always ON. CTS goes
OFF as soon as the modem
goes off-hook and remains OFF
until the handshake is
completed. Now CTS goes ON
and stays ON until loss of carrier
is detected.
Bit
Data Terminal
001 (&DO) | Modem ignores DTR.
43
Ready(DTR)
011(&D1)
|Modem is set to command stale
(See &D-command.)
detecting DTR ON to OFF
10] (&D2) | The modem hangs up if ON-to-
OFF transition on DTR
11|(&D3) | Modem goes to initialisation
state if ON-lo-OFF transition on
DTR
Bit5
| Data Carrier Detect
0) (&CO) | DCD always ON.
(DCD)
1|(&C1) | OCD ON indicates carrier
(See &C-command.)
presence.
Bit 6-7 | Not used
0
LZTR104006 R1.00
4-9
Zat 14.4/14.4-7 and 19.2/19.2-7
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