Rockwell Automation 5370-UPK CVIM USER-PAK Option - Manual (Page 50)

Chapter 6
Creating Custom Serial Port Messages
6–8
for a single inspection must be limited to 128 bytes or less, and that, even
if messages are so limited, some serial messages may not be sent if the
buffer has not had time to clear.
If you discover that you are missing messages with Buffer: No wait
selected, try using a higher baud rate, and/or shortening the length of
transmitted messages (limiting total combined serial message length for
each inspection to 128 bytes maximum). If this does not bring the desired
results, you may then want to consider using the
Buffer: Wait setting.
Before the CVIM module can communicate through the serial (RS–232) port
to another device, the CVIM module and the other device must be connected
through a suitable communication cable, and the communications parameters
for the serial ports of both devices must match. This section discusses the
serial port connections, and setting CVIM module communication
parameters.
Equipment Connections
Your CVIM module will have either one or two serial ports, depending on
the hardware version – Series A hardware supports one serial port, while
series B or later support two serial ports (serial ports A and B).
The CVIM module serial ports are accessible through the I/O Interface box.
There are two versions of interface box – Catalog No. 2801–N21 (one serial
port), Catalog No. 2801–N27 (two serial ports). To use an I/O interface box,
you must connect the box via cable to the MODULE I/O port on the CVIM
module. To link a device to a CVIM module serial port, you will need a
suitable communications cable. Refer to the CVIM Communications Manual
for more information regarding hardware connections for communications.
Note: The USER–PAK serial port message feature accommodates up to
two serial ports (serial ports A and B) on the CVIM module.
RS–232 Port Connections
and Configuration