Modem configuration
Parameters in Uni-telway mode
Introduction
Calling slave mode parameters
Transmission speed
The Uni-telway protocol is proposed by default.
To use a modem with the Uni-telway protocol, the Uni-telway transmission parameters must be completed.
z z z z z z
They are split into six windows: the Calling slave mode window the Transmission speed window the Wait timeout window the Data window the Stop window the Parity window
The window looks like this:
Calling slave mode
Server address (AD0) 1
Number of server addresses (AD0) 2
It is used to select card addresses: z Server address (AD0) : selects the standard address used in Uni-telway slave z mode
Number of addresses : selects the address number used in Uni-telway mode: z z the default value is 2.
if it is a calling station , you are advised to leave 2 as the value in this field.
The window looks like this:
Transmission Speed
9600 Bits/s z z
It is used to set the transmission speed: possible values are 4800 bits/s and 9600 bits/s.
you are advised to adjust transmission speed according to the remote devices.
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Wait timeout
Data
Stop
Parity
Modem configuration
The window looks like this:
Wait timeout (ms)
Default 1000 z z z
Wait timeout is the maximum waiting time for a link acknowledgment message from a remote device (not to be confused with the application response to READ_VAR , for example): possible values are 30 ms and 30 s.
the default value is 1 s.
you are advised to adjust the transmission time to the transmission speed, and to increase the timeout over long distances (e.g. inter-continental links) or in the event of a poor quality telephone link.
The field cannot be modified. The Uni-telway protocol imposes use of 8 data bits per character.
You are advised to adjust this field according to the remote device. Generally the
Uni-telway protocol imposes use of 1 data bit per character.
Note: This field becomes unmodifiable if parity is odd or even.
The window looks like this:
Parity
Even Odd Without z z z
This field is used to define the addition or non-addition of a parity bit, and its type.
Possible values are Even, Odd, or none.
The default value is odd. Generally, parity is odd
You are advised to adjust this field according to the remote device. Generally, parity is odd for Uni-telway protocol.
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