Antona ANC-6090 User manual

Antona Corporation [phone]
i
Rev. B
$ 5.00
ANC - 6090
RS-422/485 Serial Communications Adapter
Antona Corporation, Los Angeles, CAAntona Corporation, Los Angeles, CA

Antona Corporation [phone]
1
Antona Corporation
Copyright
Copyright (c) 2003 by Antona Corporation. All rights reserved. No part of this
publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or
translated into any language or computer language, in any form or by any means, electronic,
mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written
permission of the Antona Corporation of Los Angeles, California.
Warranty
Antona Corporation products are warranted to be free from defects in materials and
workmanship for a period of one (1) year from the date of original shipment to customer.
This warranty is limited to the replacement or repair of parts not subjected to misuse,
neglect, unauthorized repair, alteration (except card options), accident, or failure due to the
effects of static electricity discharge.
In no event shall Antona Corporation be liable to the purchaser for loss of use, profit,
or consequential damages, or damages of any kind, including, but not limited to, accidental
loss or damage to other equipment, arising out of use of Antona Corporation equipment,
whether or not said equipment was used properly. The designer is responsible for the
determining the suitability and use of the product.
This warranty is in lieu of any other warranty, expressed, implied, or statutory,
including, without limitation, any implied warranty or merchantability or fitness for a particular
purpose. No amendment of this warranty may be effected except in writing by an officer of
the Antona Corporation.
All repair services shall be performed at the Antona Corporation plant in Los
Angeles, Ca. THE PURCHASER MUST OBTAIN A RETURN
AUTHORIZATION FROM THE ANTONA CORPORATION PRIOR TO
RETURNING ANY PIECE OF EQUIPMENT. Shipment to the Antona Corporation
will be at the expense of the purchaser, return shipment will be at the expense of the
Antona Corporation for all warranty repairs.

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TABLE OF CONTENTS
Features_________________________________________________________________________ 3
Overview ________________________________________________________________________ 3
Mechanical Specifications ________________________________________________________________ 3
Electrical Specifications__________________________________________________________________ 3
Adapter Installation_____________________________________________________________________ 4
Serial Port Powering ____________________________________________________________________ 4
External Powering______________________________________________________________________ 4
Adapter Jumper Options____________________________________________________________ 5
Figure 1 - jumper locations_____________________________________________________________________5
Transmit Control Enable - JP1 ___________________________________________________________ 5
Auto Transmit Source - JP2______________________________________________________________ 6
Photo 1 – RTS Transmit Operation ______________________________________________________________6
Receive Enable - JP3____________________________________________________________________ 6
Cable Termination - JP4_________________________________________________________________ 6
Transmit/Receive Pin Reverse Jumpers – JP5/JP6____________________________________________ 7
figure 2 – Tx/Rc Pin Reverse Jumpers____________________________________________________________7
DCD Drive – JP7_______________________________________________________________________ 7
ANC-6090 External connections _____________________________________________________ 8
DB9 to DB25 pin to pin chart - for use of adapter on a DB25 type com port_______________________ 8
RS-422/485 connections to the ANC-6090 _____________________________________________ 8
DB9 RS-422/485 Signals for Master (Multimedia Controller)___________________________________ 9
DB9 RS-422/485 Signals for Server (Receive from Master) ____________________________________ 9
RS-485 Two and Four Wire Interfacing _______________________________________________ 9
2-wire ________________________________________________________________________________ 9
figure 3 – typical 2-wire RS-485 interface________________________________________________________10
Photo 2 – 2-wire interface example _____________________________________________________________10
4-Wire_______________________________________________________________________________ 10
Appendix A – Troubleshooting Guide ________________________________________________ 11
Loopback Test________________________________________________________________________________11
CABLING (most common problem)_______________________________________________________________11
Pin Signal Definition (4-wire interfaces)___________________________________________________________11
Multidrop Cabling (2-wire interfaces)_____________________________________________________________11
Data Direction Jumpers ________________________________________________________________________12
Signal Control Jumpers_________________________________________________________________________12
Cable Termination ____________________________________________________________________________12
Powering____________________________________________________________________________________12
Program Operation____________________________________________________________________________13
RS422/485 Equipment _________________________________________________________________________13
Plugged in Backwards__________________________________________________________________________13
Now What? __________________________________________________________________________________13
Appendix B -Circuit Board Schematic________________________________________________ 14

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Features
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Overview
The ANC-6090 adapter converts the serial port RS-232C level transmit and receive
signals on an IBM compatible personal computer (Pc), or any device with an RS-232C type
interface, into bipolar-current RS-422 or RS-485 compatible signals. The adapter interface
voltage levels produced meet the EIA-232, TIA-232, RS-422 and RS-485 signals. These
adapters find wide use in high-speed long distance serial communications or to interface a
Pc with equipment that uses an RS-422 or RS-485 type input/output. The adapter is
powered by the host system’s serial port signal lines, the same way a serial port “mouse”
interface is powered. For most installations this eliminates the need for an external power
supply making this adapter an ideal choice for portable use. Extended cable runs and/or
terminated RS-422/485 connections may require more current than the serial port power can
provide so the RS-422/485 connector can accept +3v to +12v regulated DC at 100 milliamps
to provide the added power to drive the adapter.
Mechanical Specifications
Adapter case size: 2.2" X 1.2"
Connectors: Female DB9 to Pc
Female DB9 to RS-422/485 equipment
Electrical Specifications
Power requirements= 6 ma for short cable, non-terminated applications
100 ma for long and/or terminated cable applications
RS-422/485 output drive= short proof output, non-terminated operation to 150 feet,
terminated operation with external power supply to 4000 feet.
RS232 output drive=short proof output, under worse case conditions, ±5v switching
to exceed ±3v EIA RS232 specification

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Adapter Installation
Turn off the personal computer and any other remote equipment before performing
the adapter installation. Never install or remove the adapter with the power applied to
the Pc or any of the attached equipment. This could result in permanent damage to
the adapter due to static discharge.
Normally the adapter is plugged directly into the serial port male DB-9 jack on the
back of the Pc. Be sure to look at the label on the adapter to identify and insure that
the proper DB9 is plugged into the Pc’s serial jack. The ANC-6090 has female DB9s at
both ends. The user should screw the 2 mounting screws into the serial port’s hex nuts for
permanent installations to assure good long-term connection.
The adapter may be attached to a ribbon cable type extension from the Pc to the
Antona adapter. This is sometimes useful when the space is limited behind the Pc. The
ribbon cable extension should not exceed 3 feet. A 12’ shielded wire cable could also be
used. Remember that the signal is still RS-232C level leaving the computer and entering
the adapter. Also note that if the designer is using a DB9 to DB25 adapter an A-B selector
box or break-out box for testing, that all 9 pins should be connected through the adapter or
test setup. The main ANC-6090 adapter power is drawn from the host system’s RTS and
DTR lines, like a mouse interface.
Serial Port Powering
Three of the Pc’s serial port RS-232C level signals can be used by the Antona
adapter to derive power from: RTS, DTR and TX. The user must therefore insure that the
RTS and DTR signals from the Pc’s serial port are brought to a high output level 100 ms
before communicating over the adapter. Usually this is performed once during the user’s
program initialization. When the appropriate jumper is set, RTS is lowered and raised to
transmit and receive respectively for use in 2-wire interfaces.
External Powering
An external DC power source may be feed into pin 9 on the RS-422/485 DB-9
connector to supply the additional current that the adapter may need. The table “RS-
422/485 Connections to the ANC-6090” (page 9) shows the pins for using an external
source of DC to power the adapter. There are also two pads on the circuit board you can
solder leads to for applying external power. A small hole in the plastic case would need to
be added to run the power supply leads away from the adapter. Figure 1 below shows the
pad as black dots. The +3v to +12v regulated DC is soldered to the pin located just to the
right of JP7, and the power supply ground pin is soldered to the pad just above JP4.

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Adapter Jumper Options
Figure 1 - jumper locations
When shipped, the ANC-6090 is set for transmit and receive enabled always.
The output pins are set for ‘master’, the terminating resister is disconnected and RTS
is connected to DCD (JP7).
All references to ‘horizontal’ and ‘vertical’ below are in respect to figure 1
above. The schematic gives another view of each jumper showing the settings on
isolated block drawings of each jumper function.
To open the enclosure hood use a small flat blade screwdriver and carefully pry the
plastic latches on one side of the enclosure and gently separate the sides slightly (about
.020”). Place a paper clip or coin between the separated sides of the enclosure to keep it
from relatching shut while you repeat the process on the two plastic latches on the other
side of the hood. The two sides of the hood should now come apart. The computer side
mounting screws are loose within the enclosure so be careful of these small parts. To
reassemble the enclosure hood back around the adapter electronics, place the circuit board
into the enclosure half that designates signal direction with the RS-422/485 connector (the
DB-9 connector that has the jackscrews) on the arrowed end pointed to by the small
“RS422” designation. Now place the small screws back into position on the RS232, or
computer side, DB-9. Double check that the hood labeled with which end is RS-232 and
RS-422 is properly oriented before pushing the sides together and relatching the plastic
shells. Remember - the RS-422 end of the adapter is the end with the jack nuts mounted
onto the female DB-9 connector.
Transmit Control Enable - JP1
For single adapter 4-wire setups where the ANC-6090 is controlling one piece of
equipment, JP1 can be set in the horizontal position, as shipped, so that the transmit data
RS-422/485 driver lines are always asserted. For battery powered applications, it may be
desirable to turn off the transmit drivers to save current when there is no data being
transmitted using the RTS control line. When using the RTS signal to control the driver
output, the vertical position should be set. See Appendix B, the middle left hand of the
schematic for the location of JP1. The photo 1 below shows how lowering the RTS line on
the RS-232 side of the adapter (lower trace – showing RTS signal after being translated to
the inverted TTL level within the adapter) precedes transmitting the data byte out the TX+
line (upper trace).

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Auto Transmit Source - JP2
This jumper is for the ‘autoxmit’ feature of our ANC-6085 version adapter and is just
left in the horizontal position (as shipped) on the ANC-6090. See Appendix B, the lower left
hand of the schematic for the location of JP2.
Photo 1 – RTS Transmit Operation
RTS may also be used to turn on/off the receive input lines (see JP3 below). When RTS is
used, asserting the RS-232 signal ‘low’ to the adapter enables transmitting while RTS ‘high’
enables receiving. Note that DTR must be set high when RTS is low in order for the
adapter to operate when an external power supply is not being used.
Receive Enable - JP3
This 3-pin straight vertical jumper can be set to enable receiving RS-422/485 data
always (as shipped, JP3 set on the lower and middle pin), or turned off automatically
whenever the transmit driver is set active by RTS (JP3 set on the middle and upper pin).
See Appendix B, the middle left hand of the schematic for the location of JP3. On a 2-wire
interface if data is being transmitted and the receiver is also enabled, anything transmitted
will be ‘looped-back’ into the serial port. Since the echoed signal is the actual data that was
transferred to the interface cable, being able to see the transmitted data echoed back may
be of use for testing, authenticating, diagnostics of data output or determining when RTS
can be lowered if used to control transmission.
Cable Termination - JP4
For installation cable lengths greater than 150 feet, resister termination across the
remote receive pair end of the cable may be necessary. The ANC-6090 has a ½W 120 ohm
termination resister built in that can be placed across the receive wire pair by setting jumper
4 (JP4) located over the transmit/receive setting jumpers. As described above, an external
DC power source may be feed into pin 9 on the RS-422/485 connector to supply the
additional current that the adapter may need when terminating resisters are installed on the
receive/transmit wire pairs. Note that some multimedia equipment have internally connected
circuitry for 120 ohm resister termination. If So, then even if the separation distance is less
than 150 feet, it may be necessary to provide an external source of DC. Some equipment

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also allows the user to disconnect the internal termination network for short cable runs. See
Appendix B, the upper middle of the schematic for the location of JP4.
Transmit/Receive Pin Reverse Jumpers – JP5/JP6
These two jumper sets, designated JP5 and JP6 on the circuit board and schematic,
allow the designer to swap the transmit and receive pairs on the RS-422/485 side of the
adapter. The configuration as shipped from Antona is set for ‘master’. This configuration is
for the adapter acting as a controller to multimedia type equipment with an RS-422 SMPTE
interface. Figure 1 shows the jumper locations from the component side of the circuit board.
The user may move all four jumper shunts on the component side of the card from the
‘horizontal’ controller configuration to the ‘vertical’ receiver configuration. All four shunts
must be changed to either all horizontal or all vertical for proper adapter operation
figure 2 – Tx/Rc Pin Reverse Jumpers
DCD Drive – JP7
This 2-pin jumper disconnects the DCD serial port input line from the RTS signal
output. When not jumpered a small amount of current is saved by not holding the DCD line
high when RTS is high. RTS is one of the two main power sources for the adapter and is
used to control the transmit and receive function in RS-485 type configurations. This jumper
is enabled when shipped by a short trace between the two jumper pads on the solder side of
the PCB. If the designer wishes to disconnect the RTS to DCD connection, just use an
Exacto knife to cut and remove the small trace between the two pads of JP7. Reconnection
may be performed by soldering in a small wire through the two pad holes of JP7. See
Appendix B, the upper middle of the schematic for the location of JP7. Be sure to verify that
the application program either does not rely or use the state of the DCD input pin for
operation.

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ANC-6090 External connections
Signal Function DB-9 Pin # Comment Data Direction
DCD/R
LSD Data Carrier Detect 1Connected via JP7 to RTS input to computer
RX RECEIVE DATA 2RS-232 level input input to computer
TX TRANSMIT DATA 3RS-232 level output output from computer
DTR Data Term Ready 4+v to power
adapter output from computer
GND GROUND 5Signal ground I/O signal ground
DSR Data Set Ready 6Tied to DTR (pin 4) input to computer
RTS Ready to Send 7+v to power
adapter output from computer
CTS Clear to Send 8Tied to RTS (pin 7) input to computer
RI Ring Indicator 9Not connected input to computer
DB9 to DB25 pin to pin chart - for use of adapter on a DB25 type com port
Function DB-9 Pin # DB-25 Pin Comment
DCD/RLSD Data Carrier Detect 1 8
RX RECEIVE DATA 2 3 RS-232 level input
TX TRANSMIT DATA 3 2 RS-232 level output
DTR Data Term Ready 4 20 +v to power adapter
GND GROUND 5 7 signal ground
DSR Data Set Ready 6 6 tied to DTR (pin 4)
RTS Ready to Send 7 4 +v to power adapter
CTS Clear to Send 8 5
RI Ring Indicator 9 22
RS-422/485 connections to the ANC-6090
For multimedia control interfacing, the jumpering of JP5/6 is set for ‘master’ (as
shipped). A 9-pin male to 9-pin male cable wired pin-to-pin is used to connect to the
multimedia device. For other interfaces, the user hand-wires a 9-pin cable assembly from
the RS-422/485 piece of equipment to the Antona adapter with the appropriate pin to signal
interface. The only difference between the ‘master’ and ‘server’ (slave) version is the jumper
positions of JP5 and JP6 within the adapter. The electronics are exactly the same, only the
2 transmit and 2 receive signal lines are exchanged on the RS-422/485 side of the adapter.

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DB9 RS-422/485 Signals for Master (Multimedia Controller)
DB9 CONN (J2) FUNCTION IDENTIFICATION
1GROUND ground for RS-422/485 and/or external
power (same function as pin 5)
2RC- RS-422/485 minus side input
3TX+ RS-422/485 plus side output
4-not used-
5GROUND ground for RS-422/485 and/or external
power (same function as pin 1)
6-not used-
7RC+ RS-422/485 plus side input
8TX- RS-422/485 minus side output
9+V Optional +3V to +12V DC @ 100ma
DB9 RS-422/485 Signals for Server (Receive from Master)
DB9 CONN (J2) FUNCTION IDENTIFICATION
1GROUND ground for RS-422/485 and/or external
power (same function as pin 5)
2TX- RS-422/485 minus side output
3RC+ RS-422/485 plus side input
4-not used-
5GROUND ground for RS-422/485 and/or external
power (same function as pin 1)
6-not used-
7TX+ RS-422/485 plus side output
8RC- RS-422/485 minus side input
9+V Optional +3V to +12V DC @ 100ma
RS-485 Two and Four Wire Interfacing
2-wireUsually a two wire interface with multiple peripherals uses a ‘polled-response’ half-duplex
software protocol where each device has a unique device code. Generally, this requires externally
powering the Antona adapter, but for short cable runs to non-terminated equipment operating at
medium baud rates (like 9600 or less) an external power supply may not be needed. The designer
should use twisted pair wire with a impedance of 100 to 120 ohms. Low-cost CAT-5 UTP
(Unshielded Twisted Pair) wire works fine. The user must externally wire the cable with pin3
connected to pin 7 (TX+ to RC+) and pin 8 to pin 2 (TX- to RC-) on the RS-485 connector side of the
adapter. The 2 conductor cable which connects to the outside world is then wired to pin 7 (+DATA)
and to pin 2 (-DATA) of the RS-485 compatible peripheral (see figure 3 below). We offer an ANC-
CKIT cable kit, with all the hardware needed and 25 feet of CAT-5 UTP wire for this application.