tolson@gatech.edu (John F. Tolson) (08/02/89)
Could someone tell me what the name of the cable that connects the Mac to an external modem. Also does anyone knoow the name of the cable which is used with the program maclink? I have the connections which connect with the mac and a 9 pin female connector. But I need a cable with a 9 pin male connector and a 24 pin male connector. For both the cables. Does anyone know the pin connection for anyone of these two cables. If you have any information please let me know. -tolson@gatech
marc@rna.UUCP (Marc Johnson) (08/11/89)
In article <19073@gatech.edu> tolson@gatech.UUCP (John F. Tolson) writes: > > Could someone tell me what the name of the cable that connects the Mac to > an external modem. Assuming you have a Mac +, SE or II, it's just a "Mac Plus to Modem" cable. This is an 8-pin mini-DIN male to RS232C 25-pin male (DB25) cable. The pinouts are: MAC DB25P SIGNAL 2 5 Clear to Send (CTS) 3 2 Transmit Data (TD) 4 7 Ground 5 3 Receive Data (RD) Here's a picture of the connectors (NOT the sockets): DB8P DB25P _______ _________________________________ / 6 7 8 \ \ 1 2 3 4 .................. 13 / |3 4 5 | \ / \ 1 2 / \ 14 15 ................ 25 / _____ ___________________________ You can get one from many sources, but at widely varying prices. Try Altex Electronics at 800-5310-5369 (San Antonio). They have this cable for $8.95 (#AC-6). If you have a Mac 512, you'll need their cable #AC-8. > ... Also does anyone knoow the name of the cable which is > used with the program maclink? > > I have the connections which connect with the mac and a 9 pin female > connector. But I need a cable with a 9 pin male connector and a 24 pin > male connector. For both the cables. Does anyone know the pin connection > for anyone of these two cables. If you have any information please let me > know. > -tolson@gatech Here you need to be more specific. Are you trying to connect to a PC/XT or an AT? The XT has a 25-pin serial port, while the AT has the newer 9-pin connector. Essentially, you want the Mac's "Transmit Data" (TD) line to connect to the PC's "Receive Data" (RD) line, and vice versa. You can connect the cable just mentioned to a cable that has a 25-pin female on one end and a 9-pin female on the other (if it's an AT) or a 25-pin on that end (if an XT). Here are the cable pinouts for both cases: 9-pin female (DE9S) 25-pin female (DB25S) AT end Connects to Mac modem cable -------------------------------------------------------- 1 CD-Carrier Detect 8 CD 2* RD-Receive Data 3* TD 3* TD-Transmit Data 2* RD 4 DTR-Data Term Ready 20 DTR 5* Ground 7* Ground 6 DSR-Data Set Ready 6 DSR 7 RTS-Request to Send 4 RTS 8* CTS-Clear to Send 5* CTS 9 RI-Ring Indicator 22 RI Only the lines with * really need to be connected. If you're going to an XT with a 25-pin connector, it's even easier: just connect pins 7 and 5 straight thru, and criss-cross pins 2 and 3 (i.e., pin 2 on one end connects to pin 3 on the other, and vice versa.) This is called a "null modem" cable. You should also be able to get this one from Altex and other sources (try also National Computer Associates, 916-441-1568 - Sacramento). Good luck! =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= = Marc Johnson BITNET: rna!marc@rockvax.bitnet = = Rockefeller Univ. Neurobiology UUCP: ...cmcl2!rna!marc = = New York City INTERNET: marc%rna@rocky2.rockefeller.edu = = (129.85.2.1) = = = = "Gimme the beat boys and free my soul, I wanna get lost in your rock & roll = = ...and drift away" = =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=