Tait TOP - Circuit Operation; GPIO Port and Signal Details

48 T2000 Radio Encryption M2259-00-200-812
Encrypted Radio Programming and Service Manual Copyright TEL
programmed, this button function is set to Aux, Latching.
The low voltage reset from the radio is used to reset the module circuit.
Signal levels and pin assignments
5.2 Programming the T2000 radio
Standard radio programming software is used.
Ensure the Accessory function key is enabled and configured to latching. For T2000 versions
with no accessory key, set a function (
Fn) key for this function.
5.3 Programming the Encryption Module
Note: To set up a T2000 radio as an OTAR programming radio, it should have a flex fitted,
but no encryption module.
Equipment setup and programming instructions are described in the Transcrypt Programming
section on page 69 or the Midian Programming section on page 79, depending upon the origin of
the encryption module.
Refer also to programming and service manuals with your Transcrypt or Midian encryption
module and programmer.
Service Desk OTAR programming may be unsuccessful if:
 the target radio is open during programming
 the programming radio and the target radio are oriented differently eg one laying down, one
upright
Function Mode Name Pin Module T2000
Power Supply V+ 1 5V regulated
Reset I/P RS 2 Active low Resets whenever supply lower
than 4.75V
Tx pressel I/P PTT 3 Active low 5V – 0
Busy I/P RX 4 Active low 5V – 0
Mode I/P MO 5 Active low Level sensitive
Data to Scrambler I/P D-SC 6 Hardwired module
programming I/P
If reqd.
Data to Radio O/P D-RA 7 Hardwired module
programming O/P
If reqd.
Mode Indicator O/P IND 8 Active high 3mA into LED
Emergency I/P EMG 9 Active Low Module pull-up to 5V
Code select 8 I/P CS8 10 Active Low Module pull-up to 5V
Code select 4 I/P CS4 11 Active Low Module pull-up to 5V
Code select 2 I/P CS2 12 Active Low Module pull-up to 5V
Code select 1 I/P CS1 13 Active Low Module pull-up to 5V
Ground Gnd 14
Transmitter to
scrambler
I/P TX-SC 15 AC coupled to 250Hz 300 mV p-p at 1kHz for 2/3
max deviation
Scrambler to
transmitter
O/P SC-TX 16 DC coupled Approx. unity thru gain
Receiver to scrambler I/P RX-SC 17 AC coupled to 250Hz 650 mV p-p at 1kHz for 2/3
max deviation
Scrambler to Receiver O/P SC-RX 18 DC coupled Approx. unity thru gain
Audio alert O/P AL 19 DC Coupled
Trunking delay I/P TRK 20 Provision for future