The service port is the RS-232 connection data terminal equipment (DTE) that uses a standard 9-pin male "D" shell connector. To connect to a personal computer or terminal, you must have a "null modem" cable. Figure 44, Table 16, and Table 17 show the pin layout designations for this connector.
Figure 43. Service port pin layout
Table 25. DB-9 RS-232 connector pin assignments
Pin Number | Signal Name | Abbreviation | Direction Relative to the SAN Data Gateway |
1 | Carrier detect | CD | In |
2 | Receive data | RD | In |
3 | Transmit data | TD | Out |
4 | Data terminal ready | DTR | Out |
5 | Signal ground | SG | -- |
6 | Data set ready | DSR | In |
7 | Request to send | RTS | Out |
8 | Clear to send | CTS | In |
9 | Ring indicator | RI | In |
Table 26. Null modem cable connections
Service Port Pin Number | Signal Name | 9-Pin AT Connector | 25-pin (DB25) Connector (DTE) |
1 | Carrier detect (not used) | N/C (not connected) | N/C (not connected) |
2 | Receive data <-> Transmit data | 3 | 2 |
3 | Transmit data <-> Receive data | 2 | 3 |
4 | Data terminal ready <-> Data set ready | 6 | 6 |
5 | Signal ground | 5 | 7 |
6 | Data set ready <-> Data terminal ready | 4 | 20 |
7 | Request to send <-> Clear to send | 8 | 5 |
8 | Clear to send <-> Request to send | 7 | 4 |
9 | Ring indicator (not used) | N/C (not connected) |
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