E1 serial communication not exactly like B1


#1

Currently my client has an AS/400 which talks to a B1 board over a serial link. In preparation for upgrading their system and using Ethernet for communication we installed an E1 board and connected the serial interface to the AS/400 just like the B1. In theory the AS/400 should communicate with the E1 just like it did with the B1 using the Optomux protocol. In practice things didn’t work so well.

I used a data scope to monitor communications both with the old B1 in place and then with the new E1 in place. The B1 traffic looks exactly like I expect as per the Optomux protocol documentation. The E1 however seems to send an extra reply message after the first command sent by the AS/400. This extra reply is throwing the AS/400 program off and things go downhill from there.

Portions of those communication logs with markups/comments are here:

  • http://dl.dropbox.com/u/3016655/OptoLogs/B1.pdf
  • http://dl.dropbox.com/u/3016655/OptoLogs/E1.pdf
(Sorry, I tried to attach these files to this forum post but was not successful.)

Updating the programming on the AS/400 is not an easy option. I’m hoping someone might be able to explain why the E1 is sending me the extra reply message and if there is a way I can make it behave more like the B1. Note that I have not connected the Ethernet interface at all yet. Once that interface is established can the E1’s behavior be configured in some manner with the Opto software?

Thanks!


#2

Hi 3rady,
On this one, I strongly suggest you contact our Product Support Group, it’s FREE.
-OptoMary