The SDR-1000 does *not* use the female DB-25 port on the back as either a IEEE 1284 interface (parallel) or an RS-232 (serial) interface as defined by their physical specifications or their associated protocol.
It uses the pins in the DB-25 connector to "bit bang" the SDR hardware to control different radio functions. It just so happens that PowerSDR uses the female DB-25 port on a computer (aka the "parallel port") to interface with the radio. But again, it is not using it as a true IEEE 1284 device commonly used to control printers. So what is needed is a cable, with DB-25 D-sub connectors (male connectors on both ends) with all of the pins (25) wired straight through. Also get one that has extra shielding because it is going to be used in a higher RF environment that what it was initially intended for. You will see it referred to as a 25-pin RS-232 cable, modem cable, parallel cable, serial/parallel cable depending on it's assumed application. Here are a few examples: http://www.cablestogo.com/product.asp?cat%5fid=917&sku=02665 http://www.cablesnmor.com/index.asp?PageAction=VIEWPROD&ProdID=123 http://www.infinitecables.com/pop/cb_pr-aa1-6.htm -Tim -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chuck Mayfield - AA5J Sent: Tuesday, April 29, 2008 9:11 PM To: FlexRadio List Subject: [Flexradio] SDR-1000 Manual I am confused. Perhaps someone here can help straighten me out. On page 12, concerning the parallel cable, I see this statement: "These are called RS-232 cables by some manufacturers." Is that correct? RS-232 is a serial protocol and I know that the pin diagram of RS-232 and parallel cables are distinctly different. Perhaps the cable is a Interlink cable <http://www.lammertbies.nl/comm/cable/parallel.html#intr> or a Windows 95/98/ME DCC <http://www.lammertbies.nl/comm/cable/parallel.html#intr> cable.? Is this the pin diagram for the SDR? RS232 on DB25 (RS-232C) The use of each pin including methods for spoofing signals is described in our Signal/pin primer <http://www.zytrax.com/tech/layer_1/cables/heavy.htm>. The RS-232 DB25 connector is capable of supporting two separate connections - each with its own optional clock when used in Synchronous mode <http://www.zytrax.com/tech/layer_1/cables/heavy.htm#sync> or Bit-Synchronous mode <http://www.zytrax.com/tech/layer_1/cables/heavy.htm#bit-sync>. If you are using the interface purely for Asynchronous communications <http://www.zytrax.com/tech/layer_1/cables/heavy.htm#async> then you only need those marked with (ASYNC) below or you can use even fewer (if you understand what is happening <http://www.zytrax.com/tech/layer_1/cables/heavy.htm>). The column marked *Dir* shows the signal direction with respect to the DTE <http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm#dte>. *Note:* This is NOT the same as the DB25 Parallel port on a PC <http://www.zytrax.com/tech/pc/printer.htm>. *Pin No.* *Name* *Dir* Notes/Description 1 - - Protective/shielded ground 2 TD OUT Transmit Data (a.k.a TxD, Tx) (ASYNC) 3 RD IN Receive Data (a.k.a RxD, Rx) (ASYNC) 4 RTS OUT Request To Send (ASYNC) 5 CTS IN Clear To Send (ASYNC) 6 DSR IN Data Set Ready (ASYNC) 7 SGND - Signal Ground 8 CD IN Carrier Detect (a.k.a DCD). 9 - - Reserved for data set testing. 10 - - Reserved for data set testing. 11 - - Unassigned 12 SDCD IN Secondary Carrier Detect. Only needed if second channel being used. 13 SCTS IN Secondary Clear to send. Only needed if second channel being used. 14 STD OUT Secondary Transmit Data. Only needed if second channel being used. 15 DB OUT Transmit Clock (a.k.a TCLK, TxCLK). Synchronous use only. 16 SRD IN Secondary Receive Data. Only needed if second channel being used. 17 DD IN Receive Clock (a.k.a. RCLK). Synchronous use only. 18 LL - Local Loopback 19 SRTS OUT Secondary Request to Send. Only needed if second channel being used. 20 DTR OUT Data Terminal Ready. (ASYNC) 21 RL/SQ - Signal Quality Detector/Remote loopback 22 RI IN Ring Indicator. DCE (Modem) raises when incoming call detected used for auto answer applications. 23 CH/CI OUT Signal Rate selector. 24 DA - Auxiliary Clock (a.k.a. ACLK). Secondary Channel only. 25 - - Unassigned *NOTE:* Leave all pins not specified above unconnected. db25 _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
