Impulse 3420 - Manual (Page 13)

Technical Description
Sealevel Systems COMM+8 Page 10
DB-25 Connector Pin Assignments (DB-25 Male)
Signal Name Pin # Mode
GND Ground 7
TD Transmit Data 2 Output
RTS Request To Send 4 Output
DTR Data Terminal Ready 20 Output
RD Receive Data 3 Input
CTS Clear To Send 5 Input
DSR Data Set Ready 6 Input
DCD Data Carrier Detect 8 Input
RI Ring Indicator 22 Input
Figure 9 - DB-25 Connector Pin Assignments
DB-9 (EIA-574 DTE) (DB-9 Male)
Signal Name Pin # Mode
GND Ground 5
TD Transmit Data 3 Output
RTS Request To Send 7 Output
DTR Data Terminal Ready 4 Output
RD Receive Data 2 Input
CTS Clear To Send 8 Input
DSR Data Set Ready 6 Input
DCD Data Carrier Detect 1 Input
RI Ring Indicator 9 Input
Figure 10 - DB-9 Connector Pin Assignments