PinDesignations
and
Signal Descriptions
The
mechanical specification
of
the
RS-232-C
requires a 2s-pin connector (called a
DB-2S).
The
following table specifies the pin assignments and signal descriptions as
they apply to the Radio
Shack
RS-232-C
Interface.
Pin Number Abbreviation
Description
1
PGND
Protective Ground
2
TD
Transmit Data
3
RD
Receive Data
4
RTS Request-to-Send
5
CTS
Clear-to-Send
6
DSR
DataSetReady
7
SGND
Signal Ground
8
CD
CarrierDetect
14
STD
SecondaryTransmit Data
18
SUN
Secondary Unassigned
19
SRTS Secondary Request-to-Send
20
DTR
DataTerminal Ready
22 RI
Ring Indicator
Table
2.
Pin Designations and Signal Description
ProtectiveGround:
This must bebonded to the chassis
or
equipment frame. It
may also
be
connectedto Signal Ground.
TransmitData: Direction-to datacommunication equipment. Signals on this
circuitare generated
by
the dataterminal equipmentfor transmission
of
data to
remote equipment. This signal should beheld in the marking condition during
intervals between characters and at all times when no data is being transmitted.
Received Data: Direction-fromdata communicationequipment. Signals on this
circuitare received from remote equipment which transmits data to the terminal.
This signal should be heldin the marking condition during intervals between
characters and at all times when no data is being received.
Request-to-send: Direction-todatacommunicationequipment. This signal is
required
by
the terminal equipmentto control the direction
of
data transmission by
the data communication equipment.
On
one-way
or
duplex channels,
the'
'on"
condition maintains the data communication equipment in the transmit mode.
The
"off"
condition maintains the datacommunication equipment in the non-transmit
~~.
.
On
a
half
duplex channel, the" on" condition maintains the data communication
equipmentin the transmit
mode
and inhibits the receive mode.
The'
'off" condition
maintains the data communication equipmentin the receive mode.
1/3
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