2.8 Connecting Peripherals
Pin Assignments
Circuit Type
| No. | Signal Name | Function | EIA | CCITT |
|
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|
| ||
1 | 2 | RD (RXD) | Receive Data | BB | 104 |
5 |
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|
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| |
| 3 | SD (TXD) | Transmit Data | BA | 103 |
6 | 4 | ER (DTR) | Data Terminal Ready | CD | 108.2 |
9 |
|
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|
| |
| 5 | SG | Signal Ground | AB | 102 |
| 6 | DR (DSR) | Data Set Ready | CC | 107 |
| 7 | RS (RTS) | Request To Send | CA | 105 |
| 8 | CS (CTS) | Clear To Send | CB | 106 |
Connection Charts
For connecting a PC/printer with a 9-pin RS-232C connector
PBX
Circuit Type | Signal | Pin No. | |
(EIA) | Name | ||
| |||
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|
| |
BB | RD (RXD) | 2 | |
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| |
BA | SD (TXD) | 3 | |
CD | ER (DTR) | 4 | |
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| |
AB | SG | 5 | |
CC | DR (DSR) | 6 | |
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|
| |
CA | RS (RTS) | 7 | |
CB | CS (CTS) | 8 | |
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|
PC/Printer
Pin No. | Signal | Circuit Type | |
Name | (EIA) | ||
| |||
|
|
| |
2 | RD (RXD) | BB | |
|
|
| |
3 | SD (TXD) | BA | |
4 | ER (DTR) | CD | |
|
|
| |
5 | SG | AB | |
6 | DR (DSR) | CC | |
|
|
| |
7 | RS (RTS) | CA | |
8 | CS (CTS) | CB | |
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|
|
For connecting a PC/printer with a 25-pin RS-232C connector
PBX
Circuit Type | Signal | Pin No. | |
(EIA) | Name | ||
| |||
|
|
| |
BB | RD (RXD) | 2 | |
|
|
| |
BA | SD (TXD) | 3 | |
CD | ER (DTR) | 4 | |
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| |
AB | SG | 5 | |
CC | DR (DSR) | 6 | |
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|
| |
CA | RS (RTS) | 7 | |
CB | CS (CTS) | 8 | |
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PC/Printer
Pin No. | Signal | Circuit Type | |
Name | (EIA) | ||
| |||
|
|
| |
1 | FG | AA | |
3 | RD (RXD) | BB | |
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|
| |
2 | SD (TXD) | BA | |
|
|
| |
20 | ER (DTR) | CD | |
7 | SG | AB | |
|
|
| |
5 | CS (CTS) | CB | |
6 | DR (DSR) | CC | |
8 | CD (DCD) | CF | |
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Installation Manual
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