Experimental Physics and
Industrial Control System

[email protected] (Jeff Hill) · Thu, 13 Jan 2000 15:59:43 -0700

John,

As I recall, Allen Bradley DH+ always operates at a rate of 57.6
Kbaud. The manual that accompanied our DLPC boards indicates that 
you can interface with DH+ at 57.6 Kbaud (mode 0). Alternatively, 
the unit is also capable of being an RIO virtual rack at speeds
of 57.6, 115.2, and 230.4 Kbaud (mode 1). I suspect that you are 
using mode zero. I seem to recall that Data Link Technology Inc 
recommended against configuring the PC to DLPC link faster than 57.6 
Kbaud in mode zero. The DLPC units on LEDA have been extremely 
reliable.

Jeff

> 
> The DataLink Technologies DL-PC is an ISA board that provides DH+
> communication to (as one example) an Allen-Bradley PLC. Does anyone
> know if this board runs reliably at 230 Kbaud? When connected to a
> PLC 5/20 at this rate, we observe failure within 5 minutes.
> 
> Additional info:
> 
>   o Cable is short and is properly terminated
>   o EPICS version is R3.13.1
>   o We are using Jeff Hill's modified serial driver
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System