Microcom 428T - Manual (Page 196)

Code Switching Chapter 9
9-16 428T Operator’s Manual - 880037-0141
9.3.15 British Code Page
The British Code Page is selected when SW4:(5-8) = 1110.
Refer to Section 5.1.2.4 for more details on SW4 settings.
Figure 9-15 Code Page - British