Used on TI Silent 745, but should work on all models with 15-pin EIA connector. As seen in my TI Silent 745 Video.
- DB-15 female is the EIA port on the rear of the TI terminal.
- DB-9/DE-9 is the 9-pin serial port on the back of your computer, or on your USB-to-Serial adapter
| DB-15 female | DB-9/DE-9 female | DB-15 EIA Signal Name | DB-9/DE-9 Signal Name |
|---|---|---|---|
| 11 | 1 | Data Carrier Detect (DCD) | Data Carrier Detect (DCD) |
| 13 | 2 | Transmit Data (TD) | Receive Data (RD) |
| 12 | 3 | Receive Data (RD) | Transmit Data (TD) |
| 7 | 4 | Data Set Ready (DSR) | Data Terminal Ready (DTR) |
| 1 | 5 | Signal Ground | Signal Ground |
| 15 | 6 | Data Terminal Ready (DTR) | Data Set Ready (DSR) |
| 6 | 7 | Clear To Send (CTS) | Request To Sent (RTS) |
| 10 | 8 | +12 Volts to RTS | Clear To Send (CTS) |
| not connected | 9 | Ringing Indicator (RI) | |
| 9 | shield | Protective Ground | Protective Ground |
Additionally, the following pins on the DB-15 connector are connected to each other:
| DB-15 female | DB-15 female | Signal |
|---|---|---|
| 7 | 2 | Data Set Ready -> Carrier Detect |
Originally, TI sold a "pigtail" cable which split the EIA connection in to two DB-25 connections, one for connecting the terminal to an external modem (or computer) and the other that allowed an external device to use acoustic coupler as a modem. The cable was named "AUXILIARY EIA CABLE" with TI Part Number 983847. Please note that accessing the acoustic coupler by an external device requires changing jumpers on the inside of the terminal. Please refer to "TI Silent 745 Operating Instructions" "Section V" for details.
The following is the cable pinout as taken from the TI Silent 745 Operating Instructions. P1 is the DB-15 female connector on the rear of the terminal, P2 is a DB-25 Male connector for connection to an external modem or computer, and P3 is a DB-25 female connector that allows a computer access to the acoustic coupler.
Table 5-1. Auxiliary EIA Interface Cable Pin Assignments.
| Terminal Connector (P1) | Cable Termination (P2 and P3) | Function | Interface |
|---|---|---|---|
| P1-9 | P2-1 | Protective Ground | Keyboard/Printer EIA Interface |
| P1-13 | P2-2 | Transmit Data[1] | Keyboard/Printer EIA Interface |
| P1-12 | P2-3 | Receive Data[1] | Keyboard/Printer EIA Interface |
| P1-10 | P2-4 | +12 Volts to RTS[1,4] | Keyboard/Printer EIA Interface |
| P1-1 | P2-7 | Signal Ground[1] | Keyboard/Printer EIA Interface |
| P1-11 | P2-8 | Data Carrier Detect[1,5] | Keyboard/Printer EIA Interface |
| P1-15 | P2-20 | Data Terminal Ready[1,3] | Keyboard/Printer EIA Interface |
| P1-8 | P3-3 | Receive Data[2] | Acoustic Coupler EIA Interface |
| P1-3 | P3-2 | Transmit Data[2] | Acoustic Coupler EIA Interface |
| P1-1 | P3-7 | Signal Ground[2] | Acoustic Coupler EIA Interface |
| P1-2 | P3-8 | Carrier Detect[2] | Acoustic Coupler EIA Interface |
| P1-9 | P3-1 | Protective Ground | Acoustic Coupler EIA Interface |
| P1-6 | P3-5 | Clear To Send[2,4] | Acoustic Coupler EIA Interface |
| P1-7 | P3-6 | Data Set Ready[2,4] | Acoustic Coupler EIA Interface |
NOTES
- Relative to the keyboard and printer (P2).
- Relative to the acoustic coupler internal to the terminal and on another connector (P3).
- DTR is on (> 3V) when terminal is on-line.
- EIA on (> i 3V) when power is ON.
- Held to EIA ON by external equipment: required for data reception.