Print Date 12/05/15 Page 17 of 32 S7600-00MA-08
2.2.10 RS232 Serial Control and Monitor (COM) Connector
This is a 9 Way D plug PL01 on the right hand side of the E2023 Control Unit front panel. It is used to
enable down loading of status and to enable simple control using a personal computer (PC) directly
connected to this front panel COM port. Multi-core screened cable, not exceeding 30 metres in length,
should be used for the interconnecting lead. The lead terminates in a 9 Way free D socket at the
E2023 end which is wired as follows :-
Pin 1
Not connected
Pin 2
Received Data (to E2023)
Pin 3
Transmit Data (from E2023)
Pin 4
Not Connected
Pin 5
Ground
Pin 6
Not Connected
Pin 7
Not Connected
Pin 8
Not Connected
Pin 9
Not Connected
Note that the assigned pin numbers and their functions are for a standard 9 pin plug on ‘Data Terminal
Equipment’ (DTE) such as computers. Standard crossover or ‘null modem’ leads may thus be used for
connection to a personal computer or PC. The length of the interconnecting lead may be extended by
use of compatible RS422/485 or fibre-optic line drivers.
Note that the internal connections to this connector may be re-directed to the rear panel DTE
connector PL04 by the use of an optional internal link lead (see section 2.2.7).
Full details of serial remote control procedures via this connector are given in Section 2.4.
2.2.11 TCP/IP Control and Monitor Connector (/T option only)
This is a standard RJ45 connector SK08 mounted in an additional screened box fitted to the rear of
the E2023-02 or E2023-04 Control Unit. This enables all the control and monitoring detailed in Section
2.4 to be performed using TCP/IP (Transmission Control/Internet Protocol)
This arrangement requires the unit to be assigned a unique Internet Protocol address. When first
connected to the network via its RJ-45 connector, the E2023’s TCP/IP adapter will attempt to acquire
an IP address automatically (it’s quite common to have networks configured to use ‘DHCP’, which
provides these addresses on demand). The address to which a device has been assigned can then be
determined and, if required, be overridden with a desired fixed value, using Eddystone supplied
software.
Note that internal linking leads determine if control and monitoring is via this connector or the front
panel RS232 COM port connector (both cannot be used together).
2.2.12 FWD/REV Output (Analogue Monitor) Connectors
These are two 50
Ω
SMC coaxial sockets PL13/14 at the left rear of the E2025 Combiner Unit. They
provide DC analogue output voltages corresponding to the Transmitter output forward and reverse
powers. Coaxial screened cable, not exceeding 3 metres in length, should be used for the
interconnecting leads.
PL13 provides the forward power indication at a level of approximately 1.5V at 250W, 2V at 500W,
2.8V at 1kW and 4V at 2kW (limited by maximum transmitter output power).
PL14 provides the reverse power indication at a level of approximately 1.4V at maximum rated output
power with a 15dB return loss load.
Both outputs are from impedances of approximately 5k
Ω
.
