A SERVICE OF

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50 CHAPTER 2: INSTALLATION
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