Hardware Information
Serial Port COM1 (PLC/V.24/Modem) *
The serial port (COM 1) on the Box PC has the following pinout:
1 14
13 25
Figure 7-1 COM 1 Serial Port (Socket Connector)
Pin No. | Designation | Description | Input /Output |
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1 | - | Shield | - |
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2 | TxD (D1) | Serial transmit data | Output |
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3 | RxD (D2) | Serial receive data | Input |
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4 | RTS (S2) | Request to send | Output |
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5 | CTS (M2) | Clear to send | Input |
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6 | DSR (M1) | Data set ready | Input |
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7 | GND (E2) | Functional ground | - |
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| (reference potential) |
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8 | DCD (M5) | Data carrier detect | Input |
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9 | +TTY RxD | TTY receive | Input |
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10 - 17 | - | Unassigned | - |
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18 | +TTY TxD | TTY send | Output |
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19 | +20mA | Isolated current source | - |
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20 | DTR (S1) | Data terminal ready | Output |
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21 | TTY send | Output | |
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22 | RI (M3) | Incoming call | Input |
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- | Unassigned | - | |
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*The line current (TTY) interface is an optional product feature.
SIMATIC Box PC 620 Manual | |
