Omron CJ - REFERENCE MANUAL 02-2010 Reference Manual page 881

Table of Contents

• When more data is input to the Serial Communications Board's serial port than is specified in N, that

data will be discarded when RXD(235) is executed. In contrast, extra data input to the CPU Unit's RS-

232C port will not be discarded when RXD(235) is executed.

• When RXD(235) is executed, data is stored in memory starting at D, the Reception Completed Flag

(note (a)) will turn OFF (even if the Reception Overflow Flag (note (c)) is ON).

• With the CPU Unit's built-in RS-232C port, if the RS-232C Port Restart Bit (note (d)) is turned ON,

the Reception Completed Flag (note (a)) will be turned OFF (even if the Reception Overflow Flag is

ON), and the Reception Counter (note (b)) will be cleared to 0.

• Specification of monitor in bits 4 to 7 of C for the CS and DR signals takes effect as follows:

1) If CS signal monitoring is specified in C, the status of the CS signal will be stored in bit 15 of D.

2) If DR signal monitoring is specified in C, the status of the DR signal will be stored in bit 15 of D.

3) If CS and DR signal monitoring is specified in C, the status of the CS signal will be stored in bit 15

of D and the status of the DR signal will be stored in bit 14 of D.

• If 1, 2, or 3 hex is specified for CS and DR signal control in C, RXD(235) will be executed regardless

of the status of the Receive Completed Flag (note (a)).

• Receive data will not be stored if CS or DR signal monitoring is specified.

• Up to 259 bytes can be received, including the receive data (N = 256 bytes max.), the start code, and

the end code.

• Specify the size of the receive data, not including the start code and end code, in N.

Note Related Auxiliary Area and CIO Area Addresses

(a) Reception Completed Flags

Built-in RS232C port

Serial Communications Board port 1: