Rockwell Automation 57C428 Toledo Scale Interface Module - Manual (Page 18)

4Ć2
Registers 14 through 18 contain information on the number and
quality of messages received on the serial link. These counters will be
incremented only if the startĆofĆmessage character (STX) is
recognized by the module. Typically, these registers are used for
diagnosing the serial link when problems occur. Refer to figure 4.3.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 bits
register 14 number of good messages received
not used
number of checksum or parity errors
number of overrun errors
number of framing errors
15
16
17
18
Figure 4.3Ć Receive Message Status
Register 20 is the configuration/update request register. The module
continually monitors this register, and will reĆconfigure the link
anytime the update flag is set. Refer to figure 4.4.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 bits
register 20 - - - - - - - 0 update request
NonĆzero for update request
Figure 4.4 Ć Configuration/Update Request Register
Register 21 defines the serial port baud rate. The baud rate may be
1200, 2400, 4800, 9600 or 19,200. Refer to figure 4.5.
Register 22 defines the link inactive" timeĆout value to aid the user in
detecting link failures. Each time a startĆofĆmessage character (STX)
is received, a timer is initiated with this value. If the timer expires, the
next request by the application program for the scale data will result
in link inactive" status being returned. The timeĆout value is specified
in seconds with a minimum value of one and a maximum value of 10.
The default value is five. See figure 4.5.