Rs-232C Interface (Option) - Radio Shack TRS-80 PT-210 Service Manual

RS-232C Interface (Option) (76-1 002)
FG:
(Frame Ground)
TD:
(Transmit Data)
0
RD:
(Receive Data)
-
RTS :
(Request to Send)
-
CTS:
(Clear to Send)
-
DSR
(Data Set Ready)
-
CF
,
(CD)
(Carrier Flag)
-
DTR:
(Data Terminal Ready)
This must be bonded to the chassis or equipment frame. It may also be con-
nected to SG.
Direction-to data communication equipment.
Signals on this circuit are generated by the data terminal equipment for transmis-
sion of data to remote equipment. This signal should be held in the marking con-
dition during intervals between characters and at all times when no data is being
transmitted.
Direction-from data communication equipment.
Signals on this circuit are received from remote equipment which transmits data
to the terminal.
This signal should be in the marking condition during intervals between charac-
ters and
at
all times when no data is being received.
Direction-to data communication equipment.
This signal is required by the terminal equipment to control the direction of data
transmission by the data communication equipment. On one-way or duplex chan-
nels, the "off" condition maintains the data communication equipment in the
transmit mode. The "on" condition maintains the data communication equipment
in the non-transmit mode.
On a half-duplex channel, the "off" condition maintains the data communication
equipment in the transmit mode and inhibits the receive mode. The "on" condi-
tion maintains the data communication equipment in the receive mode.
Direction-from data communication equipment.
This signal indicates input signals. The "on" condition maintains the data com-
munication equipment in the transmit mode. The "off" condition maintains the
data communication equipment in the non-transmit mode.
Direction-to data c'ommunication equipment.
This signal indicates output signals. The "on" condition maintains the data com-
munication equipments in the transmit mode. The "off" condition maintains the
data communication equipment in the non-transmit mode.