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Data Connections
RS-232 port
PT22s are equipped standard with an RJ45 DTE RS-232c serial port. This connector may be used for
direct local access or from other serial devices such as a terminal server. An RJ45 crossover cable is
provided for connection to an RJ45 DCE serial port.
Pin DTE Signal Name Input/Output
1 Request to Send RTS Output
2 Data Terminal Ready DTR Output
3 Transmit Data TD Output
4 Signal Ground
5 Signal Ground
6 Receive Data RD Input
7 Data Set Ready DSR Input
8 Clear to Send CTS Input
RJ45 to DB9F serial port adapter
Additionally, an RJ45 to DB9F serial port adapter is provided for use in conjunction with the RJ45
crossover cable to connect to a PC DB9M DCE serial port. The adapter pinouts below reflect use of the
adapter with the provided RJ45 crossover cable.
Pin DCE Signal Name Input/Output
1
2 Receive Data RD Output
3 Transmit Data TD Input
4 Data Terminal Ready DTR Input
5 Signal Ground
6 Data Set Ready DSR Output
7 Request to Send RTS Input
8 Clear to Send CTS Output
Modem Port
PT22s are equipped standard with a DB9-male RS-232C DTE Modem serial port. This connector is
typically used to connect to an external modem, but may also be used to connect to any RS-232C
device. A 9-pin female to 25-pin male cable is included for connecting the PT22s to an external
modem.
Pin DTE Signal Name Input/Output
1 Data Carrier Detect DCD Input
2 Receive Data RD Input
3 Transmit Data TD Output
4 Data Terminal Ready DTR Output
5 Signal Ground
6 Data Set Ready DSR Input
7 Request to Send RTS Output
8 Clear to Send CTS Input
NOTE: To connect to a PC serial port, a null-modem adapter and a female-to-female gender changer are required in
addition to the included cable.
LED Indicators
Units are equipped with a status LED for each power receptacle. A lit/on LED indicates that power is
being supplied at the port and a darkened/off LED indicates that there is no power at the port.
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70 • Appendices Sentry PT22
Installation and Operations Manual