Function Com_MSR() Foundation
Reads the Modem Status Register.
Syntax
Com_MSR( <nComPortNum> ;
) --> nMSRReturn
Com_MSR() returns the contents of the Modem Status Register as a numeric value. The function IsBit() must be used to detect which bits are set.
Com_MSR() returns always 0 since Windows does not support the contents of the Modem Status Register to be read or changed.
Description
#define constants to be used for IsBit() are found in XBTCOM.CH
Bits set in the return value:
| Bit | Constant | Description |
|---|---|---|
| No bit set | MSR_ERROR | Something went wrong |
| Bit 1 set | MSR_DELTA_CTS | CTS changed |
| Bit 2 set | MSR_DELTA_DSR | DSR changed |
| Bit 3 set | MSR_TERI | RI changed |
| Bit 4 set | MSR_DELTA_DCD | DCD changed |
| Bit 5 set | MSR_CTS | CTS is active |
| Bit 6 set | MSR_DSR | DSR is active |
| Bit 7 set | MSR_RI | RI detected |
| Bit 8 set | MSR_DCD | DCD is active |
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