Product specifications

24 DECserver 900GM Installation
Connector Pin Assignments (Cont.)
Table 5 (Cont.) 68-pin to Four 25-pin DB Octopus Cable Pinout
25-pin DB
Number
Twisted
Pairings
25-pin DB
Pin Number
68-Pin
Pin Number
Full Modem
Control Signal
3 1 and HOUSING HOUSING SHIELD
Pi{
2 9 TXD
P
a
i
r
{
7 43 GND
Pi{
3 10 RXD
P
a
i
r
{
7 44 and 60 GND
Pi{
4 45 RTS
P
a
i
r
{
5 11 CTS
{
20 46 DTR
Pair {
6 12 DSR
{
8 26 DCD
Pair {
22 27 RI
{
12 28 SMI
Pair {
23 61 DSRS
4 1 and HOUSING HOUSING SHIELD
Pi{
2 13 TXD
P
a
i
r
{
7 47 GND
Pi{
3 14 RXD
P
a
i
r
{
7 48 and 64 GND
Pi{
4 49 RTS
P
a
i
r
{
5 15 CTS
{
20 50 DTR
Pair {
6 16 DSR
{
8 30 DCD
Pair {
22 31 RI
{
12 32 SMI
Pair {
23 65 DSRS
NOTE: On the 68-pin connector, tie pins 67 and 68 together to enable the
software to identify the cable.