Rs-485/422 serial communications adapter (17 pages)
Summary of Contents for Antona ANC-6204
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Rev. B $ 5.00 ANC – 6204 USB to RS-232, RS-485/422 and TTL Serial Communications Adapter Antona Corporation, Los Angeles, CA Antona Corporation (818)783-4299...
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(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.
TTL I ....................................12 NTERFACE IN OUTS APPENDIX A – ANC-6204 SOFTWARE DRIVER / VIRTUAL COM PORT (VCP) ................14 APPENDIX B – ANC-6204 TROUBLESHOOTING GUIDE ........................16 Loopback Test ......................................16 CABLING (most common problem) ................................16 Pin Signal Definitions / Setting.................................. 16 Data Direction Jumpers.....................................
♦ Overview The ANC-6204 adapter converts the USB (Universal Serial Bus) port transmit/receive signal on a personal computer (PC) or Apple computer (equipped with a USB type interface) into an RS232 serial comport, a differential noise immune RS-422/485 compatible port or a TTL level signal.
When shipped, the ANC-6204 is set for transmit (JP1) and receive (JP3) enabled always. RTS is connected to CTS (JP2) to enable the handshaking lines of RS-232. TTL output (JP4) on the DB-9 female connector is disabled.
Figure 2 – transmit/receive control Transmit Enable – JP1 For single adapter 4-wire setups where the ANC-6204 is controlling one piece of equipment, JP1 is set in the position for the transmit data RS-422 driver lines are always on. This is how the adapter is shipped because it is the most commonly used mode – jumpers between the silk screened TO and RO (Transmit On, Receive On) on the PCB as noted in fig 2 above (4-wire mode).
RS-232 interface port. The jumpers should stay in the horizontal ‘no handshaking’ position unless the user is connecting an older piece of RS232 equipment that supports hardware handshaking to control data flow. See figure 3 above or the schematic for the location of JP2. Antona Corporation (818)783-4299...
For cable lengths greater than 150 feet, resister termination across the remote receive pair end of the cable may be necessary to dampen out a reflected data signal. The ANC-6204 has a ½W 120 ohm termination resister built in that can be placed across the receive wire pair by setting jumper 5 (JP5) located over the transmit/receive setting jumpers (JP6/7).
RS-422 ‘client’. The configuration as shipped from Antona is set for ‘server’. Figure 1 shows the jumper locations on the ANC-6204 circuit board and figure 6 above shows an isolated view of the jumper settings. The user can move all four jumpers on the card from the horizontal ‘server’...
This is just the opposite of the usual instructions for adapter installations. Plugging in the Antona USB adapter tells the PC or Apple operating system that a new peripheral has been attached and needs a software driver installed. The adapter can be plugged into any type ‘A’...
Antona adapter. The USB cable extension should not exceed 12 feet. Adapter Connector Interfacing There are 3 distinct serial modes the ANC-6204 can be used in – noise immune differential RS422/485, unipolar RS232 (PC ComPort) and TTL low voltage level interfacing for use in prototyping and test application.
The 2 conductor cable which connects to the outside world is then wired to the ANC-6204 adapter’s TX+ (+DATA) and to TX- (-DATA). Match TX+ to the +DATA, or +D, and TX- to –DATA, or –D, of the RS-485 compatible peripheral. Lastly, the JP5 jumper may be needed to enable the 120 ohm terminating resistor across the data lines to dampen reflected noise.
For systems where there are many clients that only occasionally transmit to the server, this arrangement has the shortest latency between a client transmit to the transmission of server data. Follow the “RS422 Connections to ANC-6204” table for pin connections. TTL Interface Pin outs The table below shows the signal pins for TTL use.
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Signal ground reference The author has used the TTL interface and notes there is one additional mode the ANC-6204 offers if JP1 and JP3 are set for AutoXmit as described above. The user can then multiplex both TTL transmit and receive over a single wire (plus ground line).
1. Download and un-ZIP the appropriate driver and virtual comport (VCP) for your system. 2. Plug in the ANC-6204 to a USB port connected to your system directly or through a USB hub. 3. The computer will detect the new hardware and prompt you through the software installation.
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(COM & LPT)’ entry and click on the ‘+’ sign in front of that heading. The window should display something like this: Look for the ‘USB Serial Port (COMx) line to determine what comport the ANC-6204 has been assigned to. In the example highlighted above, the adapter has been set for COM8.
TX+ to TX+ which is incorrect in RS422 interfacing. Make sure that you have the TX+ on the Antona adapter connected to the RC+ on the RS422 equipment and TX- connected to RC- (same for the signal coming back from the RS422 side - make sure that the Antona adapter's RC+ is connected to the TX+ and that the RC- is connected to the TX- on the RS422 equipment side.
Data Control Jumpers There are two main jumpers – JP1 and JP3 that control the operation of the signal switching on the ANC-6204 for transmit and receive enabling. Double check that you have set the jumpers correctly for your application.
We do warranty our adapters, so if it still does not work, call Antona and we will work out an adapter exchange. We can not ship out a replacement adapter before receiving back an adapter. You can have us ship a replacement adapter, charge your credit card and then charge back the credit card for the original adapter purchase price (shipping can not be refunded).
The LED transmit (Tx) and receive (Rc) indicators help in setting up and debugging initial installations of the ANC-6204 adapter by providing a quick visual check of data flow. In both 4- wire and 2-wire applications, the LEDs will read the individual transmit and receive states. The added LED circuitry is very simple consisting of 2 ultra bright LEDs and 2 –...
Appendix D -Circuit Board Schematic The schematic and card artwork are copyright protected by Antona Corporation and are included only to aid the end user to configure the adapter or for competent technical service personnel to use in maintenance or repair.
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