User`s manual
Software Manual • EKF Intelligent I/O Controller Family On
CompactPCI
- 93 -
EKF Elektronik GmbH * Philipp-Reis-Str. 4 * D-59065 HAMM (Germany)
Tel. +49 (0)2381/6890-0 * Fax. +49 (0)2381/6890-90 * E-Mail info@ekf.de * Internet http://www.ekf.de
Get Modem Status: CMDIMR_GET_MODEMSTAT
Description:
This command is used to get the current modem line setting of a port
specified by the port identifier.
Command Code:
26.
Command Data:
None.
Parameters:
None.
Data:
None.
Command Word:
0x0Y1A 0000
Flags Port ID Command Command Data
E
R
R
R
P
L
C
P
L
U
F
ID
3
ID
2
ID
1
ID
0
C
7
C
6
C
5
C
4
C
3
C
2
C
1
C
0
D
15
D
14
D
13
D
12
D
11
D
10
D
09
D
08
D
07
D
06
D
05
D
04
D
03
D
02
D
01
D0
0
0000YYYY000110100000000000000000
31 28 27 24 23 16 15 8 7 0
Reply:
Flags Port ID Command Command Data
E
R
R
R
P
L
C
P
L
U
F
ID
3
ID
2
ID
1
ID
0
C
7
C
6
C
5
C
4
C
3
C
2
C
1
C
0
D
15
D
14
D
13
D
12
D
11
D
10
D
09
D
08
D
07
D
06
D
05
D
04
D
03
D
02
D
01
D0
0
X110YYYY0001101000000000BBBBBBBB
31 28 27 24 23 16 15 8 7 0
The controller returns the current modem line status in bits 07:00 with the
RPL and CPL flags set. The modem line status can be gotten by the
.param8.data member of the command word union
EKF_IMR_COMMAND.
On error the RPL, CPL and ERR flags are set and an error code is
passed in bits 15:00 of the reply word.
Notes:
This command really returns the current value of the modem status
register (MSR) of the serial controller 16550:
Bit 7: Status of modem line
Data Carrier Detect
(DCD)
Bit 6: Status of modem line
Ring Detect Indicator
(RI)
Bit 5: Status of modem line
Data Set Ready
(DSR)
Bit 4: Status of modem line
Clear To Send
(CTS)
This command is acceptable for serial ports only.