Radio Shack TRS-80 Modem II Operation Manuals page 10

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Figure
2.
Modem
11
(Rear View)
©
RS-232-C Standard
DB-25
jack
for
connection
to
RS-232-C
Interface
of
TRS-80 Models
I,
II,
and
III,
and
16.
©
RS-232
Four-pin
DIN
jack
for
connection
to
the Serial I/O
(RS-232) of
the
TRS-80
Color
Computer.
© PWE
Jack
for the
AC
adapter
plug.
©
PHONE
Jack
for
modular-type telephone
line
cords.
©
FORCE DTR
Switch
forces
Data Terminal
Ready (DTR)
and
Carrier
Detect
(CD)
on.
When
using a
Color Computer,
set this
switch
to
ON.
When
using other computers, the
setting
of
this
switch
depends
upon
how
you program your
Modem.