Instruction manual

Communications Setup
40 025-9416
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14. Once a communications link has been established, the introductory screen shown in
Figure 15 appears.
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15. The plus prompt (+) is displayed and a ZLINK connection has been successfully
established. The Model 640 computer is now logged on.
Figure 15. Introductory ZLINK Screen
Adjusting the Modem Initialization String
If the site connection is made through the office PC’s modem, it may be necessary to alter the
modem initialization string to ensure proper handshaking. If you encounter connection problems
and a 14.4 Kbps, or faster, modem is being used, it may be necessary to disable some of the
modem’s capabilities that the M640 does not require. The most features most commonly disabled
are the following:
Data Compression
Error Correction
Flow Control
For example, on US Robotics modems the initialization string is as follows:
AT&M0&K0&I0&H0&N2& (All entered in caps)
The commands in this string equate to the following:
AT Get modem’s attention
&M0 Error Control disabled
&K0 Data Compression disabled
&I0 RX Flow Control disable
&H0 TX Flow Control disable
&N2 Force modem to 1200 baud