Which pins to jump for serial loopback10/3/2023 Hopefully a fresh Win2000-compatible BIOS will do the trick for you. here I think Sayal sells them for about 5-6 Canadian dollars. straight and crossover cables are also available in any computer store for few $$$. you can make this very small with wires only 1-2" long and then extend it using standard serial cable (saves space for times when you need to carry lot's of them). note that if you are making this cable you will need two DB9 female connectors. many plc programming cables are suitable for this too (AB cable CP3, Mitsubishi FX232CAB etc.). If you choose no handshaking, simple 2-3, 3-2 and 5-5 cable is all you need (5minutes of soldering). in such case you might be better off using second port (can be on other PC) as confirmation of succesfull connection but remember that you need so called crossover or nullmodem cable. personally i would suggest to not use hyper terminal with loopback adapter if you are new to this because you might be confused with what you see if you expect to see data comming back. usual culprits are RSLinx (running as service for example) or ActiveSync or your cell-phone sync software etc. if hyperterminal finds your port but complains that port is already used, bingo, time to find out what is causing the trouble. hyperterminal will also tell you what ports are available (it only lists installed ports). once this is ok check port operation using some sort of terminal emulator and loop back adapter for example. if you see yellow or red marks over port icon, or no port icon, you just have found your problem. Good luck! PimĬheck what windows thinks of your port, look under device manager, ports and if it is there, you will see what port number is assigned to it (no guessing port number) and if driver is installed correctly. Perhaps other users can recommend a specific one to use with A/B. It has a built in Web server.) Such a gateway also brings the advantage of unlimited cable length, and the possibility to acess the PLC over internet if the right port forwarding and router settings are done. Fixed settings also possible through user friendly HTML pages. All serial settings are emulated from the software thats using the COM port in Windows. I have good experiences with the following two: - Moxa NPort 5110 (about $115 US, fixed brand name, fairly easy configuration, robust case, fixed COM port settings) - Netbiter Serial Server (innovative company, a lot of cool stuff (MODBUS!), price I have to get back on, standard or robust model, configuration is a piece of cake. With this procedure I think you can be sure that all Windows settings and configuration for the ports are OK. You might be asked for the Win2K installation disc so be sure to have it at hand. Windows will now detect the COM port as "new hardware" and will install the default drivers with all default settings. At the device manager, select the COM port and remove it. Sorry to jump in a bit late but better late than never As a last resort you can try the following. Make note that the diagram shows pin 24 being "B" when it is actually "A".The COM3 story sounds like you have an internal modem which is assigned this COM# (this you can verify at the modems properties in the device manager). Care should be taken to ensure devices are of the same standard before connecting to avoid complications. Pin 23 is grounded in TIA-530-A.Ĭonfusion between the revisions has led to many incorrect wiring diagrams of this interface and most manufacturers still adhere to the original TIA-530 standard. Revision A changed these interchange circuits to Category II (para 4.3.6 and 4.3.7 of the standard ) and added a "Ring Indicator" on pin 22. TIA-530 originally used Category I circuits for what is commonly called "Data Set Ready" (DCE Ready, pins 6 and 22) and "Data Terminal Ready" (DTE Ready, pins 20 and 23). Most of the interchange circuits are Category I, with the exception of Local Loopback (pin 18), Remote Loopback (pin 21), and Test Mode (pin 25) being Category II. Two types of interchange circuits ("signals" or "leads") between the DCE and DTE are defined in TIA-530: Category I, which uses the balanced characteristics of EIA-422, and Category II, which is the unbalanced EIA-423. Because TIA-530 calls for the more common 25 pin connector, it displaced the similar EIA-449, which also uses EIA-422/423, but a larger 37-pin connector. It is to be used in conjunction with EIA-422 and EIA-423, which define the electrical signaling characteristics. Balanced serial interface Pinout RS-530 DTE using male DB-25Ĭurrently known as TIA-530-A, but often called EIA-530, or RS-530, is a balanced serial interface standard that generally uses a 25-pin connector, originally created by the Telecommunications Industry Association.įinalized in 1987 (revision A finalized in 1992 ), the specification defines the cable between the DTE and DCE devices.
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