Systech Corporation IPG-7700 Series, Руководство по оборудованию

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Connecting Devices to the IPG 10
DB-25
Pin
Number
RS-232
Name Direction Signal Function
2 TX I Serial data in, from remote device to IPG
3 RX O Serial data out, from IPG to remote device
4 RTS I Flow control, to enable IPG to send data
5 CTS O Flow control, to enable remote device to send data
6 DSR O Signals remote device that the IPG is attached and
powered on
7 GND Signal ground
8 DCD O Signals remote device that IPG has a valid
connection
20 DTR I Signals IPG that the remote device is attached and
powered on
22 RI O Ring Indicator
Table 2-1: EIA-232 DB-25 DCE Pinouts
Figure 2-2 shows a cable to connect most devices to the IPG/7700.
DB-25 Pin (DCE)
Number/Signal
DB-25 Pin (DTE)
Number/Signal
2 TX
22 RI
20 DTR
8 DCD
7 GND
6 DSR
5 CTS
4 RTS
3 RX
2 TX
22 RI
20 DTR
8 DCD
7 GND
6 DSR
5 CTS
4 RTS
3 RX
Figure 2-2: DB-25 to DB-25 Full Cable
The IPG/7700 does not require the use of all 9 wires. Only the RX, TX, and GND signals are
essential. DTR/DSR and RTS/CTS are only necessary for flow control. DCD is used to
indicate a connection and RI is only required for connections that need a ring indicator.