Intermec EASYCODER 7421 - Manual (Page 78)

B-8
Communications Boundaries
The information below applies to all protocols that the printer
supports.
Parameter Maximum Capacity
Message delay 9999 milliseconds
Character delay 9999 milliseconds
Message block size 255 characters (including STX and ETX
characters) Unlimited block size for
XON/XOFF
RS-232 Serial Interface
The printer supports serial communications with the RS-232
interface. Use the RS-232 serial interface in all asynchronous
point-to-point full- or half-duplex direct data communications.
The printer cable must have the pin assignments for an RS-232
serial interface shown in the following table.