| ??? 02/12/07 07:49 Modified: 02/12/07 08:12 Read: times |
#132585 - Yup, just be carefull... Responding to: ???'s previous message |
To use adequate cable!
You are familliar with different ways to conect DTE (stands for Data Terminal Equipment) and DCE (Data Communication Equipment) such as null-modem for direct link between two DTE platforms)? In this case you connect DTE and DCE so you should use 'standard' modem cable where all signals are 'direct' eg. pin1 goes to pin1, pin2 to pin2... In order to connect 2 DTE platforms (such as mC and PC) you'll need null-modem cable. To make your own null-modem cable make sure that: Tx(PC-side pin3 DB9) should be connected to Rx(mC-side pin2 DB9) and Rx(PC-side pin2) to Tx(mC-side pin3) also. And don't forget to connect the signal ground (pin5) on both sides to each other. This was the most important part. For 'covering' of additional signaling you could also do the following: RTS(PC-side pin7) to CTS(also PC-side pin8) RTS(mC-side pin7) to CTS(mC-side pin8) and DSR(PC-side pin6) to DTR(PC-side pin4) and DCD(also PC-side pin1) DSR(mC-side pin6) to DTR(mC-side pin4) and DCD(also mC-side pin1) as shown on the schematics of SBC:http://www.8052.com/sbc/schematics/sbc13_power.gif Best luck, CN |
| Topic | Author | Date |
| Interfacing 8051 to Voice Modem | 01/01/70 00:00 | |
| DTMF | 01/01/70 00:00 | |
| 56k Modem vs MT8880+TEA1062 | 01/01/70 00:00 | |
| external modem and voice? | 01/01/70 00:00 | |
| It's a voice modem | 01/01/70 00:00 | |
| Interfacing to modem | 01/01/70 00:00 | |
| Voice | 01/01/70 00:00 | |
| Line Interface | 01/01/70 00:00 | |
| Thanks for the head-up | 01/01/70 00:00 | |
| RS232 + AT commands? | 01/01/70 00:00 | |
| http://members.aol.com/cpu8052/modem1.html | 01/01/70 00:00 | |
| Rgd the schematic | 01/01/70 00:00 | |
| Yup, just be carefull... | 01/01/70 00:00 | |
| Even better! | 01/01/70 00:00 | |
| Heads up on the schematic | 01/01/70 00:00 | |
| Will do, big thanks | 01/01/70 00:00 | |
| Unusable code? | 01/01/70 00:00 | |
| Code is usable. (Modem1.asm) | 01/01/70 00:00 | |
| So you should know better! | 01/01/70 00:00 | |
have you not heard of 'reading the manual'? | 01/01/70 00:00 | |
| A Project of two halves! | 01/01/70 00:00 |