BK8x00 - FB COM-Port
This function block can be used to connect (via the serial interface of the BXxxxx) the BK8000 serial Bus Coupler with RS485 and BK8100 with RS232 connection. The maximum baud rate is 38400 baud.
VAR_INPUT
stCOMConfig :ST_COMConfig;
byAddress :BYTE;
byLen :BYTE;
byMaxInputLen :BYTE;
ptDataOut :POINTER TO BYTE;
ptDataIN :POINTER TO BYTE;
bStart :BOOL;
TmOut :TIME;
Legend
stComConfig: Structure for selecting the COM parameters
byAddress: BX8x00 address 1-98 (0 and 99 are reserved)
byLen: data length in [BYTES] (only even numbers are permitted, i.e. 0, 2, 4, ...)
byMaxInputLen: is connected with SIZEOF and the variable that is linked with ptDataIN
ptDataOut: is connected with ADR and data out
ptDataIn: is connected with ADR and data in
bStart: rising edge starts the function block
TMOut: delay until process is aborted
VAR_OUTPUT
bBusy :BOOL;
bError :BOOL;
iErrorId :WORD;
Input_len :WORD;
Legend
bBusy: The function block is active as long it is TRUE.
bError: error bit
iErrorID: Error number
Input_Len: number of data that were received
|
Return parameter iErrorId |
Meaning |
|---|---|
|
0 |
No error |
|
100dec |
Error during opening of the COM port |
|
101dec |
Error during sending of data |
|
102dec |
Watchdog error, no response from the slave within the WD time |
|
105dec |
The input buffer is too small |
|
200dec |
CRC error |
|
0x80xxhex |
Bus Coupler error xx status byte of the Bus Coupler (see BX8x00 documentation) |
Hardware
RS 232 communication PIN assignment
|
BX COM1 RS232 |
BX COM2 RS232 |
BK8100 |
|---|---|---|
|
2 |
8 |
2 |
|
3 |
7 |
3 |
|
5 |
5 |
5 |
RS485 communication PIN assignment
FB settings: When using the RS485 connection it is important that the stCOMConfig variable is set to 1 and that the COM2 interface is selected.
|
BX COM2 RS485 |
BK8000 |
|---|---|
|
1 |
3 |
|
6 |
8 |
ST example program
Download (sample file)
Required material:
- BX3100 + Bus Terminal
- BK8100, KL1xx8, KL2xx8, KL9010
- Serial cable, PIN assignment: see sample program