Re: LB15 RS232 not working
First...are the cables and jumpers the same on both machines? If not, match them. Next check your parameters on the LB 15 to make sure they match the LB-10. If you are not even getting garbage, either the cable is wrong or the parameters are set so that it's not even trying to transmit due to improper handshaking. Also make sure when changing parameters that you shut the machine off at the breaker for about 2 minutes to make sure the RS board resets to the new parameters properly. Start with the parameters since they are the easiest to change.
9600-7-even-2 are what seems to work reliably. Turn on software handshaking, and wire 6-8-20 together and 5-6 together on the machine side. Then only 3 wires are needed: 1 for the ground and transmit and receive wires between the machine and PC.
Parameter bit 1 = 01001001
12=01001110
Experience is what you get just after you needed it.