Antona ANC-6185 Series User manual

Antona Corporation i(818)783-4299
Rev. C
$ 5.00
ANC - 6185
RS-485/422 Serial Communications Adapter
Antona Corporation, Los Angeles, CA
ANC-6185T ANC6185R

Antona Corporation 1(818)783-4299
Antona Corporation
Copyright
Copyright (c) 2003-2015 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.

Antona Corporation 2(818)783-4299
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 - ANC-6185 jumper locations...................................................................................................................................................5
TRANSMIT CONTROL ENABLE -JP1.............................................................................................................................................5
AUTO TRANSMIT SOURCE -JP2 ...................................................................................................................................................5
Photo 1 – Auto Transmit Operation.........................................................................................................................................................6
figure 2 – RTS low to Tx enable .............................................................................................................................................................6
RECEIVE ENABLE -JP3................................................................................................................................................................6
CABLE TERMINATION -JP4..........................................................................................................................................................6
Figure 3 – terminating resister jumpering................................................................................................................................................7
TX -RX PIN REVERSE JUMPERS –JP5/JP6...................................................................................................................................7
figure 4 – Tx/Rc Pin Reverse Jumpers ....................................................................................................................................................7
DCD DRIVE –JP7........................................................................................................................................................................8
2–WIRE /4–WIRE INTERFACE –JP8/JP9...................................................................................................................................8
Figure 5 – 2/4 wire interfacing................................................................................................................................................................8
LED INDICATOR ENABLE –JP10.................................................................................................................................................8
ANC-6185 EXTERNAL RS-232 CONNECTIONS ...................................................................................................................8
DB9 TO DB25 PIN TO PIN CHART -FOR USE OF ADAPTER ON A DB25 TYPE COM PORT .................................................................9
RS-485/422 CONNECTIONS TO THE ANC-6185...................................................................................................................9
MASTER RS-485/422 SIGNALS (AS SHIPPED)...............................................................................................................................9
SERVER (RECEIVE FROM MASTER)...............................................................................................................................................9
INTERFACE WIRING ...................................................................................................................................................................10
Terminal Block Wiring – T adapter version..........................................................................................................................10
RJ-45 Wiring – R adapter version ........................................................................................................................................10
RS-485 TWO AND FOUR WIRE INTERFACING................................................................................................................10
2-WIRE .......................................................................................................................................................................................10
Photo 2 – 2-wire interface example.......................................................................................................................................................11
4-WIRE ......................................................................................................................................................................................11
APPENDIX A – ANC-6185 TROUBLESHOOTING GUIDE................................................................................................12
Loopback Test.......................................................................................................................................................................12
CABLING (most common type problem) ..............................................................................................................................12
Pin Signal Definition (4-wire interfaces)..............................................................................................................................12
Multidrop Cabling (2-wire interfaces)..................................................................................................................................12
Data Direction Jumpers........................................................................................................................................................13
Signal Control Jumpers.........................................................................................................................................................13
Cable Termination ................................................................................................................................................................13
Powering...............................................................................................................................................................................13
Program Operation...............................................................................................................................................................14
RS422/485 Equipment...........................................................................................................................................................14
Now What?............................................................................................................................................................................14
APPENDIX B – TRANSMIT / RECEIVE LEDS ....................................................................................................................15
APPENDIX C -CIRCUIT BOARD SCHEMATIC .................................................................................................................16

Antona Corporation 3(818)783-4299
Features
♦
♦ M Me ee et ts s o or r b be ea at ts s E EI IA A- -2 23 32 2 t to o E EI IA A- -4 48 85 5 a an nd d E EI IA A- -4 42 22 2 S Sp pe ec ci if fi ic ca at ti io on ns s ( (w wi it th h e ex xt te er rn na al l p po ow we er r) )
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♦
♦ B Ba au ud d r ra at te es s t to o 1 1 M Mb ba au ud d ( (t te es st te ed d t to o 1 1. .2 2M Mb bp ps s) )
♦
♦ P Po ow we er re ed d f fr ro om m s se er ri ia al l p po or rt t f fo or r m mo os st t i in ns st ta al ll la at ti io on ns s
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er ra at ti io on n
♦
♦ O Op pe er ra at te e i in n m mu ul lt ti id dr ro op p / / m mu ul lt ti ip po oi in nt t a ap pp pl li ic ca at
ti io on ns s ( (R RS S- -4 48 85 5) )
♦
♦ S Se el le ec ct ta ab bl le e d da at ta a l lo oo op pb ba ac ck k f fe ea at tu ur re e o or r d da at ta a e ec ch ho o s su up pp pr re es ss si io on n ( (i in n 2 2- -w wi ir re e a ap pp pl li ic ca at ti io on ns s) )
♦
♦ C Ch ho oi ic ce e o of f f fi ix xe ed d, , a au ut to o o or r R RT TS S h hi ig gh h c co on nt tr ro ol ll le ed d t tr ra an ns sm mi it t a an nd d r re ec ce ei iv ve e
♦
♦ A Au ut to o- -t tr ra an ns sm mi it t ( (A Au ut to oX Xm mi it t) ) e en na ab bl le e i is s a av va ai il la ab bl le e a at t b ba au ud d r ra at te es s u up p t to o 6 64 4 K KB BP PS S. .
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♦ L La at te es st t s su ur rf fa ac ce e m mo ou un nt t t te ec ch hn no ol lo og gy y ( (S SM MT T) ) f fo or r l lo ow w p po ow we er r a an nd d s sm ma al ll l s si iz ze e
♦
♦ R Ro oH HS S C Co om mp pl li ia an nt t – – L Le ea ad d F Fr re ee e p pa ar rt ts s a an nd d c co on ns st tr ru uc ct ti io on n
♦
♦ J Ju um mp pe er ra ab bl le e t te er rm mi in na at te e ( (1 12 20 0 o oh hm ms s) ) o on n i in np
pu ut t
♦
♦ P Pl lu ug g c co om mp pa at ti ib bl le e w wi it th h R RS S- -2 23 32 2 P PC C s se er ri ia al l p po or rt t D DB
B- -9 9 c co on nn ne ec ct to or r
♦
♦ O Op pt ti io on na al l L LE ED D t tr ra an ns sm mi it t a an nd d r re ec ce ei iv ve e s st ta at tu us s i in nd di ic ca at to or rs s ( (A AN NC C- -6 61 18 85 5T TL L o or r R RL L) )
Overview
The ANC-6185 adapter converts the serial port RS-232 level transmit and receive signals
on an IBM compatible personal computer (PC), or any device with an RS-232 type interface, into
a differential noise immune RS-485 or RS-422 compatible signal. The adapter interface voltage
levels produced meet the EIA-232, TIA-232, RS-485 and RS-485/422 signals. These adapters
find wide use in high-speed long distance serial communications, multidropped 2-wire interfaces
or to interface a PC with equipment that uses an RS-485 or RS-485/422 type input/output. The
adapter is powered by the host system’s 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 the adapters an ideal choice for portable use. Extended cable runs and/or
terminated RS-485/422 connections may require more current than the serial port power can
provide so the RS-485/422 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: ANC-6185T = 2.9" X 1.3", ANC-6185R = 3.0” X 1.3”
Connectors: female DB9 to PC RS-232 serial port
ANC-6185T = 6-pin terminal block to RS485/422
ANC-6185R = RJ-45 modular connector to RS485/422
Electrical Specifications
Power requirements= 7 ma for short cable, non-terminated applications
100 ma for long and/or terminated cable applications
External Voltage = +3v to +12v DC at 100 ma minimum
RS-485/422 output drive= short proof output, non-terminated operation to 150 feet,
terminated operation with external power supply to 4,000 feet.
RS232 output drive=short proof output, under worse case conditions, ±5v switching
to exceed ±3v EIA RS232 specification

Antona Corporation 4(818)783-4299
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. 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-
6185 adapter power is drawn from the host system’s RTS and DTR lines, like a serial comport
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. If
desired, with the appropriate jumper settings, RTS is lowered and raised to receive and transmit
respectively. In this mode, DTR must be left high to power the adapter when RTS is set low.
The adapter can be powered down by lowering RTS and DTR when standby current usage is an
issue (to conserve battery power for example).
External Powering
An external +3 to +12 Voltage source may be feed into pin 1 (marked ‘V’ on the board) , and the
power supply Ground connected to pin 6 (marked ‘G’ on the PCB), on the ANC-6185T terminal
block version. See the right hand side of figure 1 below for the terminal block pinouts. Power is
wired to pin 4 on the and ground to pin 5 on the RJ-45 connector of the ANC-6185R version.
The table “RS-485/422 Connections to the ANC-6185” shows the pinouts for using an external
source of DC to power either adapter version.
There are also two pads on the ANC-6185 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. This may be useful in applications by using 2 spare wires to send
power to a remote adapter. An example would be where one externally powered ANC-6185
connected to a PC inside of an office sends power with the data signals to a roof mounted RS-
485 serial temperature reading monitor. Figure 1 below shows the pads as black dots. The
regulated +DC source 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.

Antona Corporation 5(818)783-4299
Adapter Jumper Options
Figure 1 - ANC-6185 jumper locations
When shipped, the ANC-6185 is set for transmit (JP1) and receive (JP3) enabled
always. The output pins are set for ‘master’ (JP5/6), the terminating resister (JP4) is
disconnected , RTS is connected to DCD (JP7) and 4-wire interfacing is set (JP8/9).
Jumper 10 (JP10) is used to enable powering of the optional Tx Rc LED indicators.
All references to ‘horizontal’ and ‘vertical’ below are in respect to figure 1 above. The
schematic on the last page of this manual, 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 re-
latching 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. Best to leave the enclosure
off the adapter while jumper changes are made and tested in operation. 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-485/422 end (terminal block / RJ-45)
on the arrowhead end pointed to by the small “RS485/422” designation. Now place the small
screws back into position on the RS232, or computer side, DB-9.
Transmit Control Enable - JP1
For single adapter 4-wire setups where the ANC-6185 is controlling one piece of
equipment, JP1 can be set in the horizontal position (as shipped) so that the transmit data RS-
485/422 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. When
using either the transmit data control or RTS signal control to automatically control driver
output, the vertical position MUST be set and JP2 (below) should be set for the desired
transmit control condition. See Appendix B, the middle left hand of the schematic for the
location of JP1.
Auto Transmit Source - JP2
The designer can automatically turn on the RS-485/422 transmit driver lines by using
either the transmitted data itself (JP2 set to the vertical position) or the RTS line (as shipped,
JP2 set to the horizontal position). See Appendix B, the lower left hand of the schematic for the
location of JP2. As shipped the ANC-6185 is set for one character time at 9600 baud, or about
1 millisecond. When the TX RS-232C data line starts to transmit by toggling a logic ‘high’ on
the serial port producing the raising edge of the ‘start’ bit, circuitry on the ANC-6185 will detect
and turn on the transmit RS-485/422. The photo below shows how a RS-232 character being
transmitted (top trace) triggers the transmit driver enable line (lower trace) to perform the auto
+V
gnd

Antona Corporation 6(818)783-4299
transmit (AutoXmit) function. There are actually two 9600 baud characters superimposed to
show how the transmit enable line always allows about 1ms from the falling edge of the last bit.
Photo 1 – Auto Transmit Operation
RTS may also be used to turn on/off the transmit driver lines. Normally when RTS is used,
asserting the signal ‘high’ to the adapter enables transmitting. This makes sense because more
current is used from the RTS line during transmit in self powered applications. If your application
software requires RTS to be low on transmit, you can use a wire jumper either wire-wrapped to
the top side of the circuit board or a short piece of wire soldered to the bottom side of the circuit
board to select RTS enable transmit ‘low’ and set RS-485/422 drive output as pictured in figure 2
below. 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.
figure 2 – RTS low to Tx enable
Receive Enable - JP3
This 3-pin straight vertical jumper can be set to enable receiving RS-485/422 data always
(as shipped, JP3 set on the lower and middle pin), or turned off automatically whenever the
transmit driver is active which is set by JP1 and JP2 above (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 or diagnostics of data output.
Cable Termination - JP4

Antona Corporation 7(818)783-4299
For site lengths greater than 150 feet, resister termination across the remote receive pair
end of the cable may be necessary. The ANC-6185 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 (JP5/6). An external DC power source may be necessary to
supply the additional current that the adapter may need when terminating resisters are installed
on the receive/transmit wire pairs. Some 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. Often equipment 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.
Figure 3 – terminating resister jumpering
Tx - Rx Pin Reverse Jumpers – JP5/JP6
These two jumper sets, designated JP5 and JP6 on the ANC-6185 circuit board and
schematic, allow the designer to swap the transmit and receive pairs on the RS-485/422 side of
the adapter. The configuration as shipped from Antona is set for ‘master’. Figure 1 shows the
jumper locations on ANC-6185 circuit board and figure 4 below shows the jumper settings. The
user can move all four jumpers on the card from the horizontal ‘master’ (controller) configuration
to the vertical ‘server’ (remote) configuration. All four jumpers must be changed to either all
horizontal or all vertical for proper adapter operation as shown in figure 4 below, and on the
schematic of Appendix B. For normal interfacing, use the jumpering of JP5/6 as shipped. For
other interfaces, the user hand-wires a cable assembly from the RS-485/422 piece of equipment
to the Antona adapter using either discrete wires (T version) or a male RJ-45 (R version). The
only difference between the master and server setting 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-485/422 side of the adapter. This feature is probably most
useful on the ‘R’ RJ-45 version adapter where a pre-made ethernet compatible cable may be
used. On the ‘T’ terminal block version, the designer just wires to the appropriate terminal
figure 4 – Tx/Rc Pin Reverse Jumpers
block pin per the signal function and changing the jumpers for opposite ends of the cable is not
needed.

Antona Corporation 8(818)783-4299
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. 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.
2 –Wire / 4 – Wire Interface – JP8/JP9
These two 2-pin jumpers connect the TX lines to the RC lines for configuring the ANC-
6185 for 2-wire multidrop interfacing. The jumpers are disabled when shipped for use with
separate transmit and receive wire pairs typical in 4-wire interfaces.
Figure 5 – 2/4 wire interfacing
LED Indicator Enable – JP10
If the optional LED transmit and receive indicators have been installed, JP10 may be
used to enable or disable their operation. Shipped enabled if the option was ordered. Many
times after the interface is installed and working, the LED indicators are not needed and some
applications, a source of illumination within the work room or factory floor is not desired. See
Appendix B for more details on the LED circuit operation.
ANC-6185 External RS-232 connections
Signal Function DB-9 Pin # Comment Data Direction
DCD/RLS
D Data Carrier Detect 1 Connected via JP7 to RTS input to computer
RX RECEIVE DATA 2 RS-232 level input input to computer
TX TRANSMIT DATA 3 RS-232 level output output from computer
DTR Data Term Ready 4 +v to power
adapter output from computer
GND GROUND 5 Signal ground I/O signal ground
DSR Data Set Ready 6 Tied to DTR (pin 4) input to computer
RTS Ready to Send 7 +v to power
adapter output from computer
CTS Clear to Send 8 Tied to RTS (pin 7) input to computer
RI Ring Indicator 9 Not connected input to computer

Antona Corporation 9(818)783-4299
DB9 to DB25 pin to pin chart - for use of adapter on a DB25 type com port
Signal 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-485/422 connections to the ANC-6185
The jumper pairs on JP5 and JP6 allow the designer to swap the transmit and receive wire pairs
as described in the section above covering jumper options. This feature is probably most useful on
the ‘R’ RJ-45 version adapter where a pre-made ethernet compatible cable may be used. On
the ‘T’ terminal block version, the designer just wires to the appropriate terminal block pin per the
signal functions below in the “MASTER RS-485/422 Signals” table and changing the jumpers for
opposite ends of the cable is not needed. The two tables below cover all configurations for both
versions of the ANC-6185.
Master RS-485/422 Signals (as shipped)
Terminal
Block (T) RJ-45 (R) FUNCTION IDENTIFICATION
1 4 +V Optional +3V to +12V DC @ 100ma
2 1 TX+ RS-485/422 plus side output
3 2 TX- RS-485/422 minus side output
4 3 RC+ RS-485/422 plus side input
5 6 RC- RS-485/422 minus side input
6 5 GROUND ground for RS-485/422 and/or external
power
7 -not used-
8 -not used-
Server (Receive from Master)
Terminal
Block (T) RJ-45 (R) FUNCTION IDENTIFICATION
1 4 +V Optional +3V to +12V DC @ 100ma
2 1 RC+ RS-485/422 plus side input
3 2 RC- RS-485/422 minus side input
4 3 TX+ RS-485/422 plus side output
5 6 TX- RS-485/422 minus side output
6 5 GROUND ground for RS-485/422 and/or external
power
7 -not used-
8 -not used-