Omron SYSMAC CS Series Instruction & Reference Manual page 798

3. Instructions
Instructions Mode
TXDU(256) No-protocol
and (custom)
RXDU(255)
DTXDU(262) No-protocol
and (custom)
DRXDU(261)
TXD(236) and No-protocol
RXD(235) (custom)
PMCR(260) Protocol macro
and
PMCR2(264)
 Communications Port Allocations
Although the communications port (see note) was specified in the operands of previous Serial
Communications Instructions, the Network Communications Instructions use automatic port allocation
with new communications ports (8 to 71) to enable executing up to 64 of the Network Communications
Instruction simultaneously. With these instructions, there is no need for the user to keep track of the
communications ports.
Each time one of these instructions is executed, the number of ports stored in A211 (Number of Ports
Available) will be decremented. Each time a response is returned for a communications port, the value
in A211 will be incremented. This system enables monitoring communications performance.
Communications
ports
0 to 7
8 to 71
Note The communications ports are internal logical ports (virtual ports) used to manage simultaneous execution
of communications instructions over multiple cycles (including communications processing, file handling,
etc.).
764
Serial Port of Serial Communications Unit with Unit Version 1.2 or Later
Serial Port of CJ1W-SCU22/SCU32/SCU42 Serial Communications Unit
Serial Port in CPU Unit or Serial Communications Board with Unit Version 1.2 or Later
CPU Unit/Serial Communications Board
Serial Communications Board (CS Series only)
Serial Communications
Board
Receive
Send
Application
Network Communications Instructions,
Serial Communications Instructions, easy
backup (SEND, CMND, PMCR, TXDU, etc.)
New Serial Communications Instructions
(PMCR2)
Communications ports
Serial
Communications
CPU Unit
Unit
TXDU(256)/
RXDU(255)
RXDU(255)
TXDU(256)
CJ2H CPU Unit
Serial
with unit version
Communications
1.1 or later
Unit
DTXDU(262)/
DRXDU(261)
DRXDU(261)
DTXDU(262)
TXD(236)/
RXD(235)
RXD(235)
TXD(236)
Serial Communications Unit
Send
Assignment method
Specified in operand.
0 to 7: The specified communications port is assigned.
F: The communications port is automatically assigned between 0 and 7.
Automatically assigned, with the number of available ports stored in A211.
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Serial Communications Unit
Receive