Description Of Operation - Seneca K107A Manual Del Usuario

Description of operation

The device usually stays with both its communication ports in reception state (idle
status); the first transition (character) detected at one of the ports enables the
corresponding communication channel, while the opposing port becomes the data
outlet by repeating the stream (data flow) received on the first. Whenever the data flow
is interrupted, after a period of time depending on the communication speed set, the
device returns to its previous state of reception on both ports (idle status).The time for
return to idle status is usually around 1.5 characters starting from the reception line's
last active status; in any case however, a different period of time can be selected
whenever required by protocol. The table below indicates switching times on the basis
of the transmission speed set:
Two modules can be used as insulator or repeater for a Full-Duplex connection. In this
case, it is useful that the module installed on the master's Tx line inhibit communication
direction by selecting either the X->Y direction or the Y->X direction; although switching
both dip-switches ON does not cause malfunctions, it inhibits the device with both ports
in transmission.
Signalling by LED on the front panel
LED
Green Led
on X side
Green Led
on Y side
Central Green Led
Speed (bps)
115220
57600
38400
19200
9600
4800
2400
1200
Meaning
Flashing: data presence at X-port.
Steady: inverted connection at X port or X -> Y direction
inhibition enabled.
Flashing: data presence at Y-port.
Steady: inverted connection at Y port or Y -> X direction
inhibition enabled.
A blink of the LED when the device is turned on indicates the
presence of voltage.
Switching time (ms)
0,13
0,26
0,39
0,78
1,56
3,13
6,25
12,5