Epson ESC/VP21 User Manual page 68

Fax/data modem
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Fig. 4-5 Data Path for Local Digital Loopback
To start a local logical loopback first make sure that the modem is on-line with a
remote modem. The modem can be in either the originating or answer modem.
Example - To implement a local digital loopback test
Escape:
Result Code: OK
Command:
4 - TESTING
+++
AT\N1 <CR>
ATS18= 0 &T3<CR>
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