Page 1
Contents
1.GENERAL INFORMATION 3
1-1. Introduction and Description 3
1-2. Owner Assistance 3
1-3. Equipment Supplied and Options 3
1-4. Features 3
1-5. Safety Considerations, Explicit Definitions 4
2. INSTALLATION 6
2-1. Unpacking and Initial Inspection 6
2-2. Line Voltage Selection 6
2-3. Connections 7
3. POWER ON, CONTROLS AND INDICATORS 12
4. OPERATION 13
4-1. OPERATION IN THE ACOM SYSTEM 13
4-2. USER SYSTEMS OPERATION 13
4-3. LOCAL NETWORK OPERATION 17
1
Page 2
5. MAINTENANCE 18
5-1. Cleaning 18
5-2. Fuses Replacement 18
5-3. The ACOM2000S Schematic Diagram 19
5-4. Troubleshooting 20
6. SPECIFICATIONS 20
6-1. Parameters 20
6-2. Functions 21
6-3. Storage and Shipment 21
2
Page 3
1. GENERAL INFORMATION
1-1. Introduction and Description
This manual explains the installation, operation and maintenance of the
ACOM2000S automatic antenna selector.
The ACOM2000S is an automatic 1 out of 10 antennas selector especially
designed for use with the ACOM2000A automatic linear amplifier and the
ACOM2000SW remote antenna switch. In addition it can be directly used
with the ACOMs DOS application for tuning via PC and/or to work in a
local network. Nevertheless, the ACOM2000S can be manually controlled
by the UP/DOWN buttons, and also used in other automatic antenna systems
thanks to the standard RS232 serial input and 4-bit inverted BCD parallel
output control signals for antenna number selected.
1-2. Owner Assistance
If assistance is needed, you should contact your local dealer first. If you still
have an issue you need to discuss with one of ACOMs specialists. The contact
information is as follows: fax (+359 2) 920 96 56, e-mail
acom@mail.orbitel.bg, acom@aster.net or by mail: blvd.Nikola Mushanov
151, 1330 Sofia, Bulgaria.
1-3. Equipment Supplied and Options
The ACOM2000S automatic antenna selector plus a mating cable connector
for the output control and this manual are shipped in one cardboard carton.
The remote antenna switch ACOM2000SW is a separably-purchasable
option. If you have purchased it, the same carton will contain both units.
1-4. Features
n Easy to operate: tactile + sound feedback, up/down manual selection of
1 out of 10 antennas. No operator intervention is required at all when used
with the ACOM2000A automatic HF linear amplifier. Thus the risk of
inadvertent errors, such as incorrect antenna selection is eliminated.
3
Page 4
n Antenna number 7-segment LED indicator plus sound alarm provided.
n Monitors ready to transmit parallel input signal from antenna switch
and generates transmit inhibit output signal to the transceiver for maximum
operating flexibility and anti-hot switching protection.
n Two nominal line voltages: 120 and 240VAC (50 or 60Hz).
n All functions are accessible from a PC via serial port connection. Also,
local networking capability exists for more than one set of amplifier / antenna
units working in a system. Compatible with ACOM DOS application for
antenna tuning preparation.
1-5. Safety Considerations, Explicit Definitions
The ACOM2000S automatic antenna selector is designed to meet
international safety standards. It is a Safety Class I unit, i.e. the third grounding
lead of its mains cord (which is colored yellow with two green stripes) and
the ground stud on the rear panel of the selector, marked GND, both must
be connected to the stations grounding system for safe operation.
This operating manual contains information, precautions, indications for
cautions and warnings which must be followed by the user to ensure safe
operation and to keep the ACOM2000S in safe operating condition.
PRECAUTIONS:
The EXPLICIT DEFINITIONS described below apply to this operating
manual:
W A R N I N G notes call attention to a procedure which, if not correctly
performed, could result in personal injury, fire hazard or electric shock.
C A U T I O N notes call attention to a procedure which, if not correctly
performed, could result in equipment damage, not only in the selector.
notes call attention to a procedure which, if not correctly performed,
N O T E
could result in inconvenience only.
4
Page 5
W A R N I N G HIGH VOLTAGE!
The selector works with mains AC voltage,
which is dangerous for life! For your safety, pull
the selector power plug out of the mains wall
outlet EACH TIME BEFORE you remove the
cover of the selector.
W A R N I N G
NEVER EXPOSE the selector to rain, snow or
any liquids. AVOID placing the selector in direct
sunlight.
W A R N I N G
Do not undertake on your own repairs or
changes in hardware or software of the selector
in order not to endanger your or others health
and life and not to damage the selector and the
equipment connected with it, not covered by
warranty. The manufacturer is not liable for
anothers actions and responsibility shall be
assumed by the doer.
C A U T I O N
To avoid damage (not covered under warranty) read
the Installation - S.2 of this operating manual carefully.
If you have any doubts about the installation,
operation or safety of the selector, please consult
your dealer.
5
Page 6
2. INSTALLATION
2-1. Unpacking and Initial Inspection
N O T E
Before you start any action on installing the selector,
thoroughly read through this manual. First carefully
inspect the cardboard carton and its contents for
physical damage. If damage is noticed, notify your
dealer immediately. Delay may infringe carriers
warranty conditions. Keep all packing for possible
future transportation!
Check carefully the serial number of the selector with the Table of Individual
Data (Table 2-1). If you find any discrepancies notify your dealer immediately
to have your warranty information corrected.
Selector s/n ...................
Local network self number: ......
Voltage Selector Position: .............. VAC
Table 2-1. ACOM2000S Individual Data
2-2. Line Voltage Selection
C A U T I O N
To avoid damage (not covered under warranty),
check carefully if the voltage for which the unit is set
corresponds to your mains nominal voltage.
Normally the unit is supplied with Voltage Selector set for a nominal mains
voltage of 240V. There might be exceptions in cases of special delivery and
then the voltage set is noted in the Table of Individual Data (Table 2-1). If
your mains has a different nominal voltage, it will be necessary for you to
contact your dealer for details.
6
Page 7
2-3. Connections
Connections must be accomplished in the order described below, before
you apply mains voltage to the selector.
OFF
ON
AC
d
ASW KEY O UT KEY IN
e
S.3-note
0
1
GND
ACO M 2000S S /N _______ M AD E IN BULG AR IA
abc
h
AM P PC
f,g
Fig.2-2 ACOM2000S rear panel
a) First connect the ground stud of the selector (on the rear panel, marked
GND) to the stations grounding system (Fig.2-2). Length should be as short
as practical.
b) If you will use only one control source, for instance ACOM2000A automatic
linear amplifier or only a PC or so, you will need a null modem type serial
interface cable with at least one DB9F connector. Connect it from the 9-pin
connector on the rear panel, marked AMP, to the identical control unit
connector (marked RS232 INTERFACE on the amplifier rear panel). Up
to 5m (16 feet) length is acceptable.
Select the second cable connector upon the control unit. If a 25 pin serial
port connector is available, a DB9F connector plus a 9 to 25 contact adapter
or simply a DB25F connector may be used.
Check the cable you intend to use or prepare it by yourself using the following
contact information:
7
Page 8
ACOM 2000S
CANN0N
DB9F
female
nr. 2 nr. 3 nr. 3 RxD - TxD
nr. 3 nr. 2 nr. 2 TxD - RxD
nr. 5 nr. 5 nr. 7 Signal Ground
metal case metal case metal case + nr. 1 Cable Shield
c) The connector on the rear panel, marked PC, remains free if only one
control source is used (be it amplifier, PC or other - see S.3-note). Use this
connector when you use the selector with ACOM2000A plus a personal
computer or in a local network as described in S.3 and S.4. You will need
another null modem cable as described in (b) above.
ACOM 2000S
and/or PC
CANN0N
DB9F
female
C A U T I O N
Null modem cables have RxD-TxD cross connected.
Do not use a standard cable (with RxD-TxD directly
connected) because this may result in damage in both
- selector or connected equipment. Cut all extra
connections (if any).
PC ACOM - PC
CANN0N
DB25F
female
Signal name
d) Preparation of output control cable.
A 6-wire shielded cable should be used for the output control. The minimum
wire cross-section depends on the distance from the antenna selector to
the antenna switch in your station. You can determine cable specifications
proportionally from the following table:
8
Page 9
Cable lenght,
meters (feet)
maximum
10 (33) 0.04 (31, 34) 0.23 (9)
20 (65) 0.08 (28, 30) 0.32 (12)
50 (165) 0.2 (24, 25) 0.51 (20)
125 (400) 0.5 (20, 21) 0.81 (32)
250 (800) 1.0 (17, 18) 1.15 (45)
When you use the ACOM2000SW remote antenna switch, solder all 6 wires
and the shield to mate by numbers. Use the 8-contact connector for the
selector side and the 7-contact connector for the switch as follows:
ACOM2000S ACOM2000SW
NC514 - female PC7 - female
soldering view: soldering view:
wire crossection,
mm² (AWG, SWG)
6x, minimum
wire diameter,
mm (inch/1000)
6x, minimum
1
2
shield
3
When not ACOM2000SW but another switch is used, the following
information may be needed to prepare the output control cable:
Contact: Signal name: Functional description:
nr. 1 +27V Power supply output, 200mA maximum
nr. 2 RDY Input from selector; high when ready to transmit
nr. 3 GND Common ground, shield
nr. 4 *A1 Output: BCD bit 0; low when A0 selected
nr. 5 *A2 Output: BCD bit 1; low when A2 selected
nr. 6 *A4 Output: BCD bit 2; low when A4 selected
7
5
4
8 not connected
2
6
5
7
1
3
shield
4
6
9
Page 10
nr. 7 *A8 Output: BCD bit 3; low when A8 selected
nr. 8 not connected (spare for nr.3 - GND)
You can draw up to 200mA from the +27V unregulated output (contact
nr.1) to supply your own switch (when ACOM2000SW not used). See S.5-3
for details on how the input and output signals are to be used.
e) The KEY-IN and KEY-OUT sockets on the rear panel provide extra control
signals. They could be used to improve the switching safety.
If your transceiver has a suitable input which disables transmission, we
recommend that you connect it with a cable terminated in a Phono connector
to the KEY-OUT socket of the selector. Up to 5m (16 feet) length is
acceptable.
Transceiver producers give different names to this input and they are for
instance TX-INHIBIT, MUTE, LINEAR, etc. An external pull up resistor
or software command may be needed to implement this function of the
transceiver. Check your transceivers manual or consult your dealer for
details.
If your transceiver has not such an input, dont worry - the selector will
function normally as well and then this and the next (KEY-IN) connectors
may remain unused, so skip (f) and (g).
f) If KEY-OUT is used - see (e) above - and you use the ACOM2000A
automatic linear amplifier, connect with a shielded cable, terminated in a
Phono connector, the ground on transmit signal from the transceiver to
the KEY-IN of the amplifier.
Transceiver producers give different names to this output and they are for
instance TX-GND, SEND, T/R-LINE, etc. Some transceivers require that
ground on transmit is implemented via a software command, or by changing
the setting of a switch on the rear panel, or interior of the transceiver. Check
your transceivers manual or consult your dealer for details.
Then connect with a shielded cable, terminated in two Phono connectors,
the KEY-OUT from the amplifier to the KEY-IN of the selector. Up to
5m (16 feet) total length is acceptable.
g) If KEY-OUT is used - see (e) above - but you dont use an amplifier, or
10
Page 11
your amplifier has not suitable keying signals, run a cable terminated in a
Phono connector from the transceiver socket providing ground on transmit
directly to the selector rear panel KEY-IN socket. Up to 5m (16 feet) length
is acceptable.
N O T E
If KEY-IN/OUT signals are not properly cabled, the
anti-hot protection may not work or the transmitting
may be impossible.
To insure proper cabling, check the following (when KEY-IN/OUT used):
- your transceiver must not transmit until you power on the antenna selector (all antennas are grounded).
- transmitting will also be inhibited shortly after every antenna change (for
0.2 seconds) while the antenna contacts are flying.
h) Mains plug.
Due to the different standards in different countries, the mains plug is supplied
and mounted by the dealer. He connects to the mains cord end a standard
mains plug which meets the Safety Class I units standard in your country.
The ground lead of the selectors mains cord is colored yellow with two
green stripes and the blue and brown leads are active. When the selector is
to be used with only one mains fuse, it is connected in series with the brown
lead which must be the active. If you have any doubts about the correct way
of connecting the wires, consult your dealer.
Make sure the main Power Switch on the front panel is in OFF position and
insert selectors mains plug into the wall outlet. The selector remains
switched off.
11
Page 12
3. POWER ON, CONTROLS AND INDICATORS
C A U T I O N
To avoid damage (not covered under warranty),
carefully check that the voltage for which the selector
is set corresponds to your mains nominal voltage (see
S.2-2 and table 2-1).
N O T E
Set the slide switch on the rear panel properly. If
both amplifier and PC are used, connect the units to
the AMP and PC connectors respectively and reselect the active unit when needed. If only one control
source is used (be it amplifier, PC or any other),
connect it to the AMP connector and set the slide
switch to AMP too. Otherwise antennas may not be
automatically changed.
N O T E
We recommend that you turn on the transceiver (and
amplifier if any) after the antenna selector. Turn off
the selector the last. All antennas will be automatically
grounded always when the selector is not powered.
After following all instructions in S.2, you can turn ON the Main power
switch on the rear panel. The green LED indicator must indicate antenna
number 1 blinking to remind that no command has been received yet. In
this position you may control antenna numbers UP and DOWN via the
respective push buttons.
The dot next to the figure will glow always when the last command is
executed and you are ready to transmit. It will go out when a new command
is accepted but not yet executed (for 0.2s minimum or longer if you transmit
and change antennas simultaneously). If so, warning will BEEP for 10 seconds.
The command is memorized and executed automatically after the next pause
in transmitting. If 10 seconds are exceeded, the command is rejected and
12
Page 13
the LED number remains blinking until a next command is issued. After it
has been executed, the antenna number will constantly glow.
4. OPERATION
4-1. OPERATION IN THE ACOM SYSTEM
Operation using ACOM2000A HF linear amplifier, ACOM2000SW antenna
selector and/or the ACOM DOS application for PC is automatic. No operator
intervention is needed to change antennas.
Anyway you may still change antennas manually from the selector UP/DOWN
buttons or amplifiers RCU as well. The results will be indicated on both the
selector and the RCU.
When the amplifier's auto antenna change function is set to "ON", the antenna
control from the RCU and/or the selector is equivalent. With the function
set to "OFF" use the selector's buttons when a temporary antenna change is
needed. Only the frequency segment currently used would be affected. It
will be valid until next change from RCU. Changes from RCU have a general
function in this mode, i.e. the antennas for all frequency segments are
equalized to the last number selected.
4-2. USER SYSTEMS OPERATION
When used in another system, the ACOM2000S selector can be controlled
in two ways: manually via its UP/DOWN buttons and also via the RS232
serial interface commands, issued from a PC or some kind of other control
unit.
RS232 standard and a relatively low speed of 1200bit/s are used for maximum
information reliability. This permits involving inexpensive low-pass filters with
cutoff frequencies substantially below the lowest operating frequency (for
instance 50-100kHz) in severe EMC conditions. See S.5-3 to get an idea.
Use the list of rules and serial interface commands below to control the
ACOM2000S automatic antenna selector properly.
13
Page 14
RULES FOR ACOM2000S LOCAL NETWORK
CONTROL
a) Protocol: 1200,N,8,1 (1200bit/s, no parity check, 8 information bits, 1
stop bit).
b) Local network addresses are coded via ASCII symbols with codes equal
to the needed address. For instance, address number 81dec (51hex) is sent
via the ASCII symbol Q.
Addresses 40 to 4F (hex) are reserved for amplifiers.
Addresses 50 to 5F (hex) are reserved for antenna control units (selectors
and/or tuners).
Addresses 60 to 6F (hex) are reserved for transceivers.
Addresses 70 to 7F (hex) are reserved for PC controllers.
The selector network self address (1-15) is to be coded in hexadecimal by
means of 4 jumpers inside the selector box. They are located on the PCB,
just near the quartz crystal and are marked NETWORK ADDRESS.
c) Numbers are coded in hexadecimal or decimal, by figures. Every figure is
sent via one own ASCII symbol. Symbols codes begin with 3 (the most
significant half-byte) and end on the coded figure itself in the least significant
half-byte as follows:
Figure (dec) Figure (hex) ASCII code (hex) ASCII symbol
00 30 0
11 31 1
22 32 2
33 33 3
44 34 4
55 35 5
66 36 6
77 37 7
88 38 8
99 39 9
-A 3A:
-B 3B;
14
Page 15
-C 3C<
-D 3D=
-E 3E>
-F 3F?
d) Messages format:
RX_addr. TX_addr. Comm. data_1 data_2 ... ... NULL
where:
RX_addr. - destination address (hex), sent first;
TX_addr. - sender address (hex);
Comm. - command or message code;
data_1 - first data byte (command or message parameters);
data_2 - second data byte (command or message parameters);
... - more data (parameters), if any.
NULL (00hex) - end of message, sent the last.
Rem. address 255 (FFhex) is reserved for broadcast addressed messages;
Example: QAW34 shall mean: to selector 1 (Q) from amp. 1 (A), change
antenna (W3) to nr.4 (4);
The similar command from a PC would be: QqW34
e) Rules in the local network:
- maximum symbols number in one message - 255 (including service symbols
as addresses, NULL, etc.);
- every unit in the network passes to his output anothers messages without
changes and stops the addressed to (and also from) its own address;
- every unit sends periodically its own local address, addressed to FFhex or
the mating unit address in order to inform others it is on;
15
Page 16
- selectors and amplifiers have to mate by address suffix (for instance:
amplifier 41hex with selector 51hex, or amplifier 42hex with selector 52hex
etc.) in order they collaborate as a pair;
- selectors execute W1 and W3 commands if addressed to them and also to
their mated amplifier;
- selectors filter the not-addressed single byte messages (beginning with 8x
and higher). If this info is needed, the selector must be connected in the
chain before the amplifier in order not to stop them.
f) Commands list:
Command
(ASCII)
W1* xx a
W3* a - " - - " - - - " -
* The command is executed also if addressed to the mating amplifier and
then is passed to it. If not executed in a 10 seconds period, the command
will not be passed. Broadcasting addressed commands are also executed.
** Message generated without a command.
param.
(ASCII)
-
-W3**a
Q-
Selec tor
response
Selects antenna
nr. a (0-9)
(xx is for AMP)
Checs RDY
signal after W1
or W3
commands
Mes-
sage
(ASCII)
L** -
(every 5s)
Z
or
E
Z
or
E
param.
(ASCII)
-50Ready (Z) or not
-
50
Remarks
Self address
identificator to
be registered
from an amp.
(E50) to transmit
(after switched)
Antenna nr. a
(0-9) selected
manually via
up/down buttons
if ready
if not ready
16
Page 17
NOTE
Antenna data is checked for permissible values from
0 to 9. If the antenna number included in the command is outside this range, the command is ignored.
4-3. LOCAL NETWORK OPERATION
You may control via a single port several units thanks to their local network
capabilities. For this purpose every one unit is addressed in order to be
identified in the local network. Addresses are reserved by groups. All units
in the network are divided in separate virtual local area networks. All units
addressed Xn are in group n. For instance, every one pair selector +
amplifier is to be mated by their address suffixes in order to collaborate in
a system. Addressing of the selector is done via the four jumpers on the
PCB in HEX code. Addressing of the amplifier is done via its RCU. Address
numbers 1 to 15 are selectable. See the previous S.4-2b for details.
The TX-D and RX-D serial port signals of all units are to be connected in a
closed loop chain. Every unit receives messages via its RX-D input and repeats
them to its TX-D output (if not addressed to it). In this way the messages
propagate from the sender through the chain until they meet their destination
address and stop there. If any message is occasionally returned to its sender,
the sender would stop it.
In order to minimize repetitions in the local network, respectively to increase
the propagation velocity, it is preferable that the most loaded information
links be direct. For this reason it is best that the mating unit pairs be adjacent,
although this is not mandatory.
The preferable information direction is: from the PC to the antenna selector
and then to the amplifier, when only one pair selector + amplifier is to be
controlled. In this way the fast single byte messages, generated by the
amplifier about the forward and reflected power (8x...Ax), will directly come
into the PC (and stop there).
Increasing pairs number, the information flow volume will increase and the
propagation velocity will respectively decrease. For this reason, the possibility
for controlling more than two pairs selector + amplifier via one single
serial port may practically depend on their activity. In such cases the opposite
17
Page 18
direction may be used in order to decrease the flow volume as the selector
will filter the fast messages generated by the amplifier. Of course, now
the forward and reflected power could not be frequently monitored via the
PC. Anyway, you can still measure them via the M(uv) command of the
amplifier.
5. MAINTENANCE
W A R N I N G HIGH VOLTAGE!
The selector works with mains AC voltage,
which is dangerous for life! For your safety, pull
the selector power plug out of the mains wall
outlet EACH TIME BEFORE you remove the
cover of the selector.
5-1. Cleaning
W A R N I N G
Do not use solvents for cleaning - they may be
dangerous both for you and for the selector
paint.
Do not open the selector. Cleaning of the outer surfaces can be done with a
piece of soft cotton cloth lightly moistened with clean water.
5-2. Fuses Replacement
If occasion should require replacement of the mains fuses, use only standard
ones. The two Primary Mains Fuses of the selector are located inside the
box. They are glass body 0.1A/250V slow blow, 5mm diam., 20mm
long.Contact your dealer for details.
18
Page 19
5-3. The ACOM2000S Schematic Diagram
See Fig.5-1. The automatic antenna selector ACOM2000S is based on the
single chip microprocessor AT89C2051 (U3) of Atmel. It receives antenna
change commands from two sources: serial RS232 interface (RxD, pin2)
and UP/DOWN buttons (B1, B2, pins 11 & 13). Then the microprocessor
generates parallel output code in BCD (A1, A2, A4, A8, pins 16-19) to control
the remote antenna switch.
Besides this basic function, the microprocessor serves the RS232 RxD and
TxD (pin 3) signals and network self address inputs (SW1, pins 6-9) in order
to comply the selected data protocol and local network rules (see S.4-2 and
S.4-3). An additional microprocessor job is to scan the RDY (ready) signal
from the remote antenna switch (pin 12) in order to realize the anti-hot
switching protection. Blinking the 7-segment LED indicator is done by BI
output (pin 14) and the alarm buzzer is controlled via the *BUZ (pin 15).
The quartz crystal X1 (9MHz) stabilizes the main clock frequency in order
to maintain the serial port speed within close tolerances (abt. +/- 0.1%) in
the temperature range from 0 to +50 °C. The R-C pair R29 and C17 (pin 1)
assure the delayed power-on reset of the microprocessor.
The RS232 serial interface input (RxD) from JP5:2 or JP6:2, as selected with
AMP-PC slide switch (SW4), is fed to the MC1489 receiver / level converter
(U6) and adapted from +/-12V to 0/+5V levels. The opposite operation is
done by MC1489 (U7) for the TxD signal which is fed to JP6:3.
The output BCD code is inverted and fed to the output control connector
JP1 via the open-collector buffer ULN2003A (U1A-U1D). It is also fed
through the BCD to the 7-segment decoder/LED driver 7447 (U2) to the
7-segment LED indicator A-361G (U4). The decimal point is controlled by
the RDY signal from another buffer ULN2003A (U1E).
The KEY-IN signal is buffered via Q2 and Q3 to the KEY-OUT output. The
transistors Q1 & Q2 realize an AND logic in order to inhibit transmission
when the remote antenna switch is not ready. Then Q1 is saturated, so Q3
cannot be controlled by the KEY-IN and is always in off state until RDY signal
goes in logical high.
The power supply comprises TV1 mains transformer 2x9V, D4...D11 bridge
19
Page 20
rectifiers, 7805 (U5) +5V regulator and D12, D13 parametric voltage
regulators for +/-12V supplies. The +27V supply is not regulated. Maximum
of 200mA current could be consumpted in any external unit from +27V.
5-4. Troubleshooting
If the selector indicator does not glow maybe the mains fuses have blown.
Check the line voltage selection first (see S.2-2) and then see S.5-2.
If any function is not properly executed check slide switch position (see S.3)
and then the external cabling (S.2-3). Check all cables for continuity and
short circuits. If the problem persists, contact your dealer first or ACOM
directly - see S.1-2.
6. SPECIFICATIONS
6-1. Parameters
a) Serial control input/output: +/-12V, levels, impedances, and timing comply
the RS232 standard protocol 1200, N ,8 ,1.
b) Parallel input/output control:
- logical low input: -1...+1.25V, 1.2kOhm input resistance.
- logical high input: +7.5...+18V, 1.2kOhm input resistance;
- logical low output: 0...+1V, 15mA drive, 60mA sink;
- logical high output: +20...+30V, 1.2kOhm output resistance;
c) KEY-IN:
- open KEY voltage (drive): +10...+12V;
- closed KEY current (drive): 10...12mA;
- input voltage (resistance) @ 12mA: -1...+2V (0...160 Ohm) to consider
the KEY is closed.
20
Page 21
d) KEY-OUT:
- switching voltage (open circuit): -0.5...+40V;
- switching current (closed circuit): 0...20mA sink;
- output resistance @ 20mA sink current (closed circuit): 100...120 Ohm.
e) Output power supply voltage for external devices: +20...+30V
unregulated, 0...200mA.
f) Primary Power: 100-132V (120V tap) and 200-264V (240V tap), 50-60Hz,
10VA.
g) Size & Weight (operating): W131mm x D162mm x H41mm, 1.3kg.
h) Operating temperature range: 0...+50 degs. Celsius;
6-2. Functions
a) Conversion of serial RS232 port commands to 4-bit parallel BCD inverted
output code. Manual up/down antenna number control.
b) Directly compatible with ACOM2000SW remote antenna switch,
ACOM2000A automatic HF linear amplifier, and ACOM DOS application
for tunings via PC.
c) All functions accessible from PC via serial port, local network functions
for more than one sets of amplifier / antenna units, working in a system.
d) Anti-hot switching protection for the external antenna switch.
6-3. Storage and Shipment
C A U T I O N
Should you need to transport the selector, use the
original packing as described below.
First pull the mains plug out of the mains outlet, afterwards disconnect all
21
Page 22
cables from the rear panel of the selector (remove the ground connection
the last). Finally pack the selector in the original carton. Fill in the empty
space if the ACOM2000SW antenna switch will not be transported.
a) Storage environments: the selector must be kept packed in dry and
ventilated unheated premises without chemically active substances (acids,
alkalies etc.) in the following climatic environment:
- temperature range: -40 to +70 °C;
- humidity: up to 75% @ +35 °C.
b) Shipping Size and Weight W178mm x D194mm x H182mm, 2kg (4kg
when purchased with remote antenna switch ACOM2000SW).
c) Shipping environments: all types of transportation, including aircraft
baggage section.
22
Loading...