Print Date 08/04/14 Page 18 of 34 S79005-00MA-05
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 also that the serial option requires an additional internal link lead, which re-directs the serial
remote control from the front panel COM port to the rear panel DTE connector.
Full details of serial remote control procedures via this connector are given in Section 2.4
2.2.9 Second Transmitter Remote Control Connector
This is a 15 Way D socket SK05 at the rear of the E2023 Control Unit. It is used to enable externally
derived automatic control of Transmitter muting and high/low power level setting. Multi-core screened
cable, not exceeding 3 metres in length, should be used for the interconnecting lead.
The lead terminates in a 15 Way free D plug at the E2023 end which is wired as follows :-
Pin 1
Select Low Power Input (continuous low to select)
Pin 2
Mute Transmitter Input (continuous low to mute)
Pin 3
Output Status A (continuous low state – not used)
Pin 4
Output Status B (continuous low state – not used)
Pin 5
RS485 Data (+) In (not used)
Pin 6
RS485 Data (-) In (not used)
Pin 7
RS485 Data (+) Out (not used)
Pin 8
RS485 Data (-) Out (not used)
Pin 9
Not Connected
Pin 10
Ground
Pin 11
Ground
Pin 12
Ground
Pin 13
Ground
Pin 14
Not Connected
Pin 15
Not Connected
Each input (pins 1, 2) is internally ‘pulled up’ to +5V through 12k
Ω
and must be fed from a voltage free
source of less than 1k
Ω
to ground for a low state (open-circuit for a high state). These inputs are
protected against constant application of up to
±
12V dc directly applied. Note that they are only active
when the associated E2026 Auto-Mute-Start switch is in the Auto position and have delays in the
order of 200mS.
Thus, they should not be used as part of a safety interlock system
(see 2.2.5).
Each output (pins 3, 4) is a relay contact to ground for a low state (open-circuit for a high state). The
contacts are rated at 1mA (minimum at 5V dc) to 1A maximum switching current. The maximum
voltage (including switching surges) must be limited to
±
24V dc. These outputs (and pins 5-8 inc.) are
not used and thus should not be externally connected.
2.2.10 Mains Supply Output Connectors
These are one or two standard IEC three pin (L+N+PE) sockets CON01 (except –07 and –08 variants)
and CON03 either side of the mains supply input connector. Each one is connected, via the front
panel SUPPLY DISCONNECTOR switch, to the mains supply input connector. On the dual mains
supplies -05 and –06 variants, CON01 is connected to one supply and CON03 to the other. In this
case, equipment connected to these supply outputs can be arranged in two independent groups, both
groups being switched off when the Transmitter itself is switched off using the front panel switch.
The continuous total load on output each should not exceed approximately three amps. Each output is
protected by a 6.3A (T) HBC fuse, FS5 and FS6, to allow for current surges at ‘switch-on’
