Systech Corporation RCS/5000, Hardware Manual

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Connecting EIA-232 Devices 10
Connecting EIA-232 Devices
RCS/5000
The RCS/5000 server uses a symmetrical EIA-232 data terminal equipment (DTE) pinout on
the RJ-45 serial ports. Table 2-1 lists the pinouts of the RJ-45 ports used for EIA-232 serial
communications.
RJ-45
Pin
Number
RS-232
Name Direction Signal Function
1 DCD I Signals module that remote device is
attached and powered on
2 RTS O Flow control, to enable remote device to
send data
3 SG Signal return (NOT chassis ground)
4 TXD O Serial data out, from RCS to remote device
5 RXD I Serial data in, from remote device to RCS
6 SG Signal return (NOT chassis ground)
7 CTS I Flow control, to enable RCS to send data on
TXD
8 DTR O Signals remote device that RCS is attached
and powered on
Table 2-1 EIA-232 RJ-45 Pinouts
To connect your EIA-232 device to the serial port of an RCS/5000, you need to determine
whether the device connector wiring follows the standard for data terminal equipment
(DTE) or for data communication equipment (DCE). In general, modems are wired as DCE
devices and all other devices are wired as DTE; however, some equipment manufacturers
may deviate from the standard. The manual for your device will contain information on the
pinouts for the device. Figures 2-4 through 2-7 show cable diagrams for the most common
configurations. Figure 2-8 shows a minimal cable using 3 wires.
The cable shown in Figure 2-4 or 2-5 may be used to connect most ASCII terminals or serial
printers to RCS/5000 serial ports. The cable shown in Figure 2-6 or 2-7 may be used to
connect modems to the RCS/5000. Modems should be configured to switch their carrier
detect signal (CD) on and off in response to making and breaking telephone connections.
This insures that the RCS/5000 terminates users’ sessions when they disconnect. Figure 2-8
shows a 3-wire cable.