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Command, function and parameter description Section 6-3
port
The specified serial port.
node (for HLM_MREAD, HLM_TEST, HLM_ABORT and HLM_STWR)
The Slave node number to send the Host Link command to. Range: [0, 31].
mode (for HLM_STWR)
The specified CPU Unit operating mode.
mc_area (for HLM_MREAD)
The MC Unit’s memory selection to read the send data from.
mc_offset (for HLM_MREAD)
The address of the specified MC Unit memory area to read from. Range for
VR variables: [0, 250]. Range for Table variables: [0, 7999].
See also: HLM_READ, HLM_STATUS, HLM_TIMEOUT, HLM_WRITE, SETCOM
Examples: Example 1:
The following command will read the CPU Unit model code of the Host Link
Slave with node address 12 connected to the RS-232C port. The result is writ-
ten to VR(233).
HLM_COMMAND(HLM_MREAD,1,12,MC_VR,233)
If the connected Slave is a C200HX PC, the VR(233) will contain value 12
(hex) after successfull execution.
Example 2:
The following command will check the Host Link communication with the Host
Link Slave (node 23) connected to the RS-422A port.
HLM_COMMAND(HLM_TEST,2,23)
PRINT HLM_STATUS PORT(2)
If the HLM_STATUS parameter contains value zero, the communication is
functional.
Example 3:
The following two commands will perform the Host Link INITIALIZE and
ABORT operations on the RS-422A port 2. The Slave has node number 4.
HLM_COMMAND(HLM_INIT,2)
HLM_COMMAND(HLM_ABORT,2,4)
Example 4:
When data has to be written to a PC using Host Link, the CPU Unit can not be
in RUN mode. The HLM_COMMAND command can be used to set it to MON-
ITOR mode. The Slave has node address 0 and is connected to the RS-232C
port.
HLM_COMMAND(HLM_STWR,2,0,2)
1 RS-232C serial port 1
2 RS-422A serial port 2
0 PROGRAM mode
2 MONITOR mode
3 RUN mode
MC_area Data area
MC_TABLE
(or value 8)
Table variable array
MC_VR
(or value 9)
Global (VR) variable array
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