5-3SectionSending Commands From a PC
72
The execution status of the SEND(090), RECV(098), and CMND(490) instruc-
tions is always reflected by the communications flags (i.e., the Communications
Port Enabled Flag and the Communications Port Error Flag). The CS1-series
CPU Unit’s communications flags are allocated in the Auxiliary Area as shown in
the following table.
Flag name
Address
Contents
Word Bits
Communications
Port Enabled Flag
A202 Bit 7: Port 7
Bit 6: Port 6
Bit 5: Port 5
Bit 4: Port 4
Bit 3: Port 3
Bit 2: Port 2
Bit 1: Port 1
Bit 0: Port 0
OFF: Execution enabled
(being executed)
ON: Execution disabled
(not being executed)
Communications
Port Error Flag
A219 Bit 7: Port 7
Bit 6: Port 6
Bit 5: Port 5
Bit 4: Port 4
Bit 3: Port 3
Bit 2: Port 2
Bit 1: Port 1
Bit 0: Port 0
OFF: Normal completion
ON: Abnormal completion
Note With CS1-series PCs, communications ports 0 to 7 are also used for executing
the PCMR(260) (PROTOCOL MACRO) instruction, so these flags are used in
common for SEND(090), RECV(098), CMND(490), and PCMR(260). While
PCMR(260) is being executed, SEND(090), RECV(098), and CMND(490) can-
not be executed at the same communications port.
The status of a SEND(090), RECV(098), and CMND(490) instruction after exe-
cution is reflected as a communications port completion code, in one word (two
bytes) of data as shown in the following table. (The value is 0000 during instruc-
tion execution.) The recorded status is saved until execution of the next instruc-
tion.
Word Contents
A203 Communications Port 0 Completion Code
A204 Communications Port 1 Completion Code
A205 Communications Port 2 Completion Code
A206 Communications Port 3 Completion Code
A207 Communications Port 4 Completion Code
A208 Communications Port 5 Completion Code
A209 Communications Port 6 Completion Code
A210 Communications Port 7 Completion Code
The meanings of the communications port completion codes are the same as
those for FINS commands and responses. When CMND(490) is used, however,
even if a FINS command has an abnormal completion, it will not be reflected in
the communications port completion code. For details, refer to Communications
Port Error Flag and Completion Codes for CMND(490) below.
Bits 08 to 15 in the communications port completion code correspond to the first
byte of the response code, and bits 00 to 07 correspond to the second byte. For
details, refer to 10-6 Troubleshooting With Response Codes.
Communications Flags
Communications Port
Completion Codes
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