3. Instructions
878
CS/CJ/NSJ Series Instructions Reference Manual (W474)
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 RS and DR signal control in C, RXDU(255) 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.
• The logical port number can be set to any value between 0 and 7 and is specified with bits 12 to 15 of
C+1.
• The logical port number can be allocated automatically by setting bits 12 to 15 of C+1 to F. For
details, refer to Automatically Allocating Communications Ports (i.e., Internal Logical Ports) on page
1115.
Note Related Auxiliary Area and CIO Area Addresses
(a) Reception Completed Flags (n = CIO 1500 + 25 × unit number)
Port 1: Bit 6 of n+9
Port 2: Bit 6 of n+19
(b) Reception Counters (n = CIO 1500 + 25 × unit number)
Port 1: n+10
Port 2: n+20
(c) Reception Overflow Flags (n = CIO 1500 + 25 × unit number)
Port 1: Bit 7 of n+9
Port 2: Bit 7 of n+19
(d) Overrun Error Flags (n = CIO 1500 + 25 × unit number)
Port 1: Bit 4 of n+8
Port 2: Bit 4 of n+18
(e) Transmission Error Flags (n = CIO 1500 + 25 × unit number)
Port 1: Bit 15 of n+8
Port 2: Bit 15 of n+18
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