EIA
Pin |
| DCE | Function/Signal | Pin | DTE | Function/Signal |
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| Position | Name |
| Position | Name |
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1 | Shield/Frame Ground | 1 | Shield/Frame Ground | |||
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2 | TXD | 2 | TXD | |||
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3 | > | RXD | 3 | RXD | ||
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4 | RTS | 4 | RTS | |||
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5 | > | CTS | 5 | CTS | ||
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6 | > | DSR | 6 | DSR | ||
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7 | Signal Ground | 7 | Signal Ground | |||
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8 | DCD | 8 | DCD | |||
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14 | DATA RESTRAINT | 14 | DATA RESTRAINT | |||
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15 | > | TRANSMIT CLOCK | 15 | TRANSMIT | ||
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| or V.54 Loop 3 * |
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| CLOCK |
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16 | > | STANDBY | 16 | STANDBY | ||
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| INDICATOR |
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| INDICATOR |
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17 | > | RECEIVE CLOCK | 17 | RECEIVE CLOCK | ||
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18 | EXTERNAL | 18 | EXTERNAL | |||
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| RECEIVE CLOCK |
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| RECEIVE CLOCK |
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| or V.54 Loop 3 * |
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20 | DTR | 20 | DTR | |||
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21 | > | V.54 Loop 2 | 21 | V.54 Loop 2 | ||
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22 | > | RI/TM * | 22 | NC | (No Connection) | |
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24 | EXTERNAL TRANS- | 24 | EXTERNAL | |||
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| MIT CLOCK |
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| TRANSMIT |
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| CLOCK |
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25 | TEST MODE | 25 | MAKE BUSY | |||
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* Pin assigned double function as follows: |
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Pin 15: Outputs TRANSMIT CLOCK if the port is configured for internal clocks. Otherwise it acts as a V.54 Loop 3 signal when connected to a modem.
Pin 22: Used as the Ring Indicator output if the port is configured to emulate a dial modem. For this to work properly, the RI/TM switch of the port must be set to RI. When the RI/TM switch is set to TM, this pin acts as an input, and the TM output from the attached modem (pin 25 on the modem) comes into the 6500 on this pin.
Cables |
