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Unit 34 Park House Watford Business Park Greenhill Crescent Watford Herts GB WD18 8PH
Reg. No. 2855535 Telephone: +44 (0) 1923 256 000 Fax: +44 (0) 1923 256 100 email: [email protected]
4.1.2
Tally Output.
1
3
2
TR
BC817-16
R
330R
TALLY PROCESSOR
U
S
E
R
O
U
T
P
U
U
T
R
10R
Figure 10 Tally Output
The user Tally Output is an open collector transistor. The drain should be
<200mA. An electro-mechanical relay can be operated by this as shown in the
example below.
Figure 11 Tally interface to relay.
4.1.3
RS232 Interface.
This loosely follows the pin convention of EIA-561 which is a standard for RS232
on an RJ45 cable. Only TX, RX and Signal ground (pin 4) are implemented. For
the LI-1D the following RS232 parameters apply:
115Kbaud
8 Bits, no parity
1 Stop bit.