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8 LOCAL USER INTERFACE
8.3 ASCII INTERFACE
The pin-to-pin connections for the cable connectIng the ASCII port to plug PL2 on the back of the LPS-D are
shown in Figure 8–2: MODEM CABLE. Virtually any standard communications package on a PC with a serial
interface may be used. The ASCII serial interface must be programmed to the same parameters as the remote
communications ports. The ASCII port's handshaking mode must be set to either XON/XOFF or DTR ready.
The LPS-D setting COMFORT affects both the baud rate of the RS232 port (plug PL1) and the ASCII port PL2.
Figure 8–3: 25-PIN NULL MODEM CABLE shows a Null modem cable for the 9-pin front port PL-1.
T D
2
R D
3
R T S
4
C T S
5
D S R
6
G N D
7
D C D
8
D T R
2 0
RI
2 2
T O
R E L A Y
PL-1 & 2
TD
2
RD
3
RTS
4
CTS
5
DCD
8
DSR
6
RI
22
DTR
20
G N D
7
TO RELAY
PL-2 & 3
The following programs have been tested and known to support the ASCII interface on the LPS-D. Note that
most any communications package that emulates a TTY type terminal should communicate successfully.
•
Procomm Plus (vendor: Datastorm)
•
Windows Terminal Program (vendor: Microsoft; included in Windows 3.1/95/98 systems)
GE Power Management
R E M O T E C O M M U N I C A T I O N S M O D E M C A B L E
Figure 8–2: MODEM CABLE
REMOTE COMMUNICATIONS PC DIRECTLY
NULL MODEM CABLE
Figure 8–3: 25-PIN NULL MODEM CABLE
8.3.2 RECOMMENDED REMOTE COMMUNICATIONS PACKAGE
LPS-D Line Protection System
8.3 ASCII INTERFACE
8.3.1 DESCRIPTION
2
T D
3
R D
4
R T S
5
C T S
6
D S R
7
G N D
8
D C D
2 0
D T R
2 2
RI
T O
M O D E M
2
TD
3
RD
4
RTS
5
CTS
8
DCD
6
DSR
22
RI
20
DTR
7
G N D
TO PC
8-
27
8
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