Re: [neonixie-l] RS232 line driver
On 8/23/12 11:46 PM, Michel wrote: I am after a driver like the MAX232 that has 5V levels on one side; +/- 5 on the other side and only requires a +5V supply. The MAX232 however is a 16 pin device and I am looking for something smaller (8 pins). I only need one Rx and one Tx channel. I am also thinking, maybe I don't need one and just use 0V and 5V levels rather than -5V and +5V, but not sure if that will work. Anybody knows more about that? Michel The problem is that an RS-232 driver must make more than 5V to meet the spec., so it will have four capacitors to make +/-10V from +5V, needing more than 8 pins. There is another spec RS-423 which is 5V, but I don't think there are any drivers for it that run from +5V only. The standard river is the MC3488A, which requires +/-5V. -- David Forbes, Tucson AZ -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [neonixie-l] RS232 line driver
If you don't mind surface mount, a MAX3313e is quite small and will do the job. Nigel. - Original Message - From: Michel mic...@xiac.com To: neonixie-l neonixie-l@googlegroups.com Sent: Friday, August 24, 2012 7:46 AM Subject: [neonixie-l] RS232 line driver I am after a driver like the MAX232 that has 5V levels on one side; +/- 5 on the other side and only requires a +5V supply. The MAX232 however is a 16 pin device and I am looking for something smaller (8 pins). I only need one Rx and one Tx channel. I am also thinking, maybe I don't need one and just use 0V and 5V levels rather than -5V and +5V, but not sure if that will work. Anybody knows more about that? Michel -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [neonixie-l] RS232 line driver
I thought that the 'dead' band for 232 was -3V to +3V. I have used 5V with printers and modems of the 1970s/80s. Some 'cheap' RS232 drivers only used -5V and Gnd.eg the Microbee computer. Over short distances all sorts of liberties can be taken - it works; just don't call it 232 ! John K Australia - Original Message - From: David Forbes dfor...@dakotacom.net To: neonixie-l@googlegroups.com Sent: Friday, August 24, 2012 4:57 PM Subject: Re: [neonixie-l] RS232 line driver On 8/23/12 11:46 PM, Michel wrote: I am after a driver like the MAX232 that has 5V levels on one side; +/- 5 on the other side and only requires a +5V supply. The MAX232 however is a 16 pin device and I am looking for something smaller (8 pins). I only need one Rx and one Tx channel. I am also thinking, maybe I don't need one and just use 0V and 5V levels rather than -5V and +5V, but not sure if that will work. Anybody knows more about that? Michel The problem is that an RS-232 driver must make more than 5V to meet the spec., so it will have four capacitors to make +/-10V from +5V, needing more than 8 pins. There is another spec RS-423 which is 5V, but I don't think there are any drivers for it that run from +5V only. The standard river is the MC3488A, which requires +/-5V. -- David Forbes, Tucson AZ -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [neonixie-l] RS232 line driver
I'm with John, if it for personal purposes, and the run is short (10ft/3m), you don't need to strictly adhere to the RS-232 spec. Just a pair of transistor inverters, and label the connectors, Mickey-Comm, and you may just get away with 0-5V. Scope it, at your max intended baud rate, just to make sure the signals aren't badly distorted. If tolerable, your done, and on to the next project. On Friday, August 24, 2012 12:57:14 AM UTC-7, johnk wrote: I thought that the 'dead' band for 232 was -3V to +3V. I have used 5V with printers and modems of the 1970s/80s. Some 'cheap' RS232 drivers only used -5V and Gnd.eg the Microbee computer. Over short distances all sorts of liberties can be taken - it works; just don't call it 232 ! John K Australia -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/7fpMMD1gmnQJ. For more options, visit https://groups.google.com/groups/opt_out.
