I N T E R F A C E
R S - 2 3 2 C
The TR270 rear panel includes a standard DB-9F connector
which conforms to the RS-232C serial data communica-
tions standard. The transceiver is configured to be a DCE
device. As such, the transceiver may be controlled with a
standard dumb terminal or PC running any standard termi-
nal emulation software such as PROCOMM PLUS
TM
,
BITCOM
TM
, Windows Terminal Program, etc.
This interface provides for direct control of the transceiver's
front panel, including volume and squelch. The front panel
controls can be locked out when under computer control
by pressing and holding the
0
LOCK
button.
Please refer to FIGURE 14 for individual pin and signal
description.
NOTE:
The following additional items apply when using the
RS-232C Interface capability of the transceiver:
FCC WARNING:
SHIELDED INTERFACE CABLES MUST BE USED WITH THIS
TRANSCEIVER FOR FCC COMPLIANCE TO LIMITS FOR A
CLASS B DIGITAL DEVICE.
When interfacing the transceiver to a computer utilizing a
25 pin male connector for the RS-232C serial port, the
following wiring convention should be followed:
Note: This equipment has been tested and found to
comply with the limits for a Class B digital device, pursuant
to Part 15 of the FCC rules. These limits are designed to
provide reasonable protection against harmful interfer-
ence in a residential installation. This equipment gener-
ates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with the instructions,
may cause harmful interference to radio communications.
However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception,
which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and the
transceiver.
- Connect the equipment into an outlet on a circuit differ-
ent from that to which the transceiver is connected.
- Consult the dealer or an experienced radio/TV techni-
cian for help and for additional suggestions.
The user may find the following booklet prepared by the
Federal Communications Commission helpful: "How to
Identify and Resolve Radio-TV Interference Problems." This
booklet is available from the U.S. Government Printing
Office, Washington D.C. 20402, Stock No. 004-000-00345-4.
FIGURE 14 RS-232C Interface Connections
PROCOMM PLUS
TM
is registered to DATASTORM
Technologies, Inc.
P.O. Box 1471
Columbia, MO 65205
BITCOM
TM
is registered to BIT Software, Inc.
830 Hillview Court, Suite 160
Milpitas, CA 95035
Rear Panel View of TR270 RS-232C Connector
13245
Pin
1
2
3
4
5
6
7
8
9
Signal Description
Data Carrier Detect Output
Transmit Data Output
Receive Data Input
No Connection ______
Ground Ground
Data Set Ready Output
Ready to Send Input
Clear to Send Output
No Connection ______
8679
Function
DCD
TXD
RXD
N.C.
GND
DSR
RTS
CTS
N.C.
Computer Control 37
Transceiver DB9F
Connector
1
2
3
4
5
6
7
8
9
Computer DB9M
Connector
1
2
3
4
5
6
7
8
9
Computer DB25M
Connector
8
3
2
20
7
6
4
5
22
(472 pages)
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