The Digi PortServer TS is always a DTE device, asserting TxD, DTR, and RTS while monitoring RxD, DSR, CTS, DCD, and RI from the remote DCE device.
| Pin Number |
Pin Name |
Description (may be empty) |
| 1 | RI | Ring Indicator |
| 2 | DSR | Data Set Ready |
| 3 | RTS | Request to Send |
| 4 | CGND | Chassis Ground* |
| 5 | TxD | Transmit Data |
| 6 | RxD | Receive Data |
| 7 | SGND | Signal Ground* |
| 8 | CTS | Clear to Send |
| 9 | DTR | Data Terminal Ready |
| 10 | DCD | Data Carrier Detect |
*While the Digi user guide offers no expansion for either the CGND or SGND acronym labels, other Digi manuals make reference both to a CGND bonded to a connector shell or chassis and a separate and distinct signal ground, allowing confident assumption of these descriptions. Furthermore, continuity testing performed on a bare PortServer TS 4 MEI showed no discernable difference between the CGND and SGND pins as measured from the metal chassis.
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