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This number may be obtained from B&B Electronics Customer Service at (815) 4335100. PackagesreceivedwithoutanRMAnumberwillnotbeaccepted. B&B Electronics' technical staff is also available to answer any questions that might arise concerning the installation or use of your Model 2011. Technical Service hours: 8AM to 5PM CST, Monday through Friday. 2011AS3297 Manual B&B Electronics --PO Box 1040 --Ottawa, IL 61350 PH (815) 433-5100 --FAX (815) 434-7094 2.0 GENERAL INFORMATION Thank you for your purchase of this B&B Electronics product. This product has been thoroughly inspected and tested and is warranted for one year parts and labor. If any questions or problems arise during installation or use of this product, please do not hesitate to contact B&B Electronics Technical Support at (815) 433-5100. 2.1 FEATURES • Conforms to CCITT V.22 and V.14 Standards • Lets asynchronous terminals communicate with synchronous modems and multiplexers • Accepts character lengths to 11 bits • Requires no AC power or batteries • Supports data rates to 64 Kbps • Automatically adjusts synchronous data rates • Miniature size • Plugs directly into async. or sync. DB-25 port • Accepts external clocking • Made in the USA 2.2 DESCRIPTION The B&B Model 2011 asynchronous to synchronous converter plugs directly into a local asynchronous DTE (terminal, PC, etc.) and connects that DTE, via RS-232 cable, to a synchronous DCE. When the same set-up is installed on the remote end, the local and remote DTEs can communicate over the synchronous link. Drawing power from either the synchronous or asynchronous RS-232 interface, the Model 2011 needs no AC power or batteries to operate and supports RS-232 data rates from 64 Kbps. Because the Model 2011 automatically adjusts the synchronous data rate to match the asynchronous DTE's output rate, no data rate strapping is necessary. The Model 2011 derives clocking externally from the clock of the synchronous DCE, and imposes no limit on data block size. Characters may be up to 11 bits long. Measuring only 3.2" x 2.0" x .75", the Model 2011 is housed in a sturdy ABS plastic case. It comes fully equipped with a DB-25 male connector and a DB-25 female connector, which plug directly into the synchronous and asynchronous ports. 2011AS3297 Manual B&B Electronics --PO Box 1040 --Ottawa, IL 61350 PH (815) 433-5100 --FAX (815) 434-7094 3.0 CONFIGURATION The Model 2011 is configured using internal DIP switches. Figure 1 shows the location of the Model 2011's configuration switches. Figure 1. Switch locations on the Model 2011 PC board 3.1 ACCESSING INTERNAL SWITCHES The Model 2011's DIP switches are mounted on the PC board. To access the PC board, insert the blade of a small flathead screwdriver into the slot on one side of the Model 2011's case, then pop the case open by twisting the blade. Repeat on the other side of the case. You should now be able to pull the case halves apart and access the DIP switches on the PC board. Once you have set the switches properly, align the case halves and snap them together. 3.2 SETTING INTERNAL SWITCHES Three DIP switches are used to configure the Model 2011: two switches set the character length and one switch matches the signaling rates of the asynchronous and synchronous ports. Figure 2 shows the orientation of the DIP switches. Figure 2. DIP switch orientation 2011AS3297 Manual B&B Electronics --PO Box 1040 --Ottawa, IL 61350 PH (815) 433-5100 --FAX (815) 434-7094 3.2.1CHARACTERLENGTH Switches SW1-1 and SW1-2 operate jointly to set the asynchronous character length. The asynchronous character length setting is determined by combining the number of start, stop, data and parity bits that make up each character generated by the asynchronous DTE. The Model 2011 does not care about the composition of each asynchronous character, only its length is significant. Below are the combined switch settings that set the four possible asynchronous character lengths: SW 1-1 SW 1-2 8bit OFF ON 9 bit ON ON 10 bit OFF* OFF* 11 bit ON OFF * Default settings 3.2.2EXTENDEDSIGNALINGRATE(ESR) The position of switch SW1-3 ensures that the asynchronous input data rate matches the synchronous output data rate. When switch SW1-3 is set to OFF, the asynchronous bit rate must match the synchronous clock rate to a tolerance of -2.5% to +1%. When switch SW1-3 is set to ON, the asynchronous bit rate must match the synchronous clock rate to a tolerance of -2.5% to +2.3%. SW 1-3 -2.5% to +1% OFF* -2.5% to +2.3% ON *Default settings NOTE: Switch SW1-4 is not used. 2011AS3297 Manual B&B Electronics --PO Box 1040 --Ottawa, IL 61350 PH (815) 433-5100 --FAX (815) 434-7094 4.0 INSTALLATION The Model 2011 is designed to be used inpairs, with one unit installed between an asynchronous DTE and a synchronous DCE on either end of a synchronous communication link. Figure 3 illustrates a typical Model 2011 installation. Figure 3. Typical Model 2011 application 4.1 CONNECTING THE ASYNCHRONOUS PORT The asynchronous port of...