3Com 3C63311 Reference Guide - Page 62

Serial Port LEDs, RD active green

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50 CHAPTER 2: INSTALLATION Table 18 Connector Pinouts for X.21 DCE cable (60-pin Connector) to DB-15 Female Signal Name Frame GND Circuit GND RTS CTS DSR DCD (DCD should be tristated when in DTE mode) DTR LL (not used) SD+ SDRD+ RDSCTE+ SCTESCR+ (SCR+ and should be tristated when in DTE mode, double term., double buffer) SCRSCT+ SCTShorting GR 1 Pin # on 60-pin Connector 46 15 1, 2 9, 10 Pin # on DB-25 Connector 1 8 3, 10 5, 12 Direction (for Serial Port) In Out Out Out In In 28 2 In 27 9 In 11 4 Out 12 11 Out In In 24 6 Out 23 13 Out Out Out 47, 48 Serial Port LEDs In addition to the common LEDs described earlier in this chapter, the following LEDs indicate the status of the serial port. See Figure 20. RD active (green)-Flashes with receiving signals. TD active (green)-Flashes with transmitting signals. Figure 20 PathBuilder S330/S310 Serial Port LEDs TD RD

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50
C
HAPTER
2: I
NSTALLATION
Serial Port LEDs
In addition to the common LEDs described earlier in this
chapter, the following LEDs indicate the status of the serial port. See Figure 20.
RD active (green)
—Flashes with receiving signals.
TD active (green)
—Flashes with transmitting signals.
Figure 20
PathBuilder S330/S310 Serial Port LEDs
Table 18
Connector Pinouts for X.21 DCE cable (60-pin Connector) to DB-15 Female
Signal Name
Pin # on 60-pin
Connector
Pin # on DB-25
Connector
Direction (for
Serial Port)
Frame GND
46
1
Circuit GND
15
8
RTS
1, 2
3, 10
In
CTS
9, 10
5, 12
Out
DSR
Out
DCD (DCD should be
tristated when in DTE
mode)
Out
DTR
In
LL (not used)
In
SD+
28
2
In
SD-
27
9
In
RD+
11
4
Out
RD-
12
11
Out
SCTE+
In
SCTE-
In
SCR+ (SCR+ and -
should be tristated
when in DTE mode,
double term., double
buffer)
24
6
Out
SCR-
23
13
Out
SCT+
Out
SCT-
Out
Shorting GR 1
47, 48
TD
RD