AED9101D
22 I3563-1.0 en
6.3.2 Connection via RS‐422
The RS-422 interface is a 4-wire interface with a max-
imum cable length of 1000m. Connecting the AED to the
COM port of a PC (RS-232) requires an interface con-
verter (HBM interface converter: 1-SC232/422B). Only
one AED can ever be connected to each interface on the
PC.
Slide DIP switches S1 to S5 to the left, switch S6 and the
switch for bus termination (termination) to the right (ON).
The arrangement is the same as for the 4‐wire version of
the RS‐485 interface, see Fig. 6.9 on page 23.
6.3.3 Connection via RS‐485
You have two options for connection via the RS‐485
interface:
1. RS-485 with a 4-wire connection
This connection allows the full range of AED functions
with a maximum cable length of 1000 m, and is the
preferred option.
2. RS-485 with a 2-wire connection
This connection also allows cable lengths up to
1000 m. However, only COF formats 64 69 are
then possible. So when starting up, the relevant COF
command must be the first command sent. The com-
mand MSV?0; must not be used, as in this mode of
operation, it is no longer possible to interrupt meas-
urement output with command STP;. The interface
converter must be set to 2-wire operation.
In both cases, an interface converter is required at the
PC's (RS-232) COM port (HBM interface converter:
1-SC232/422B). The advantage of this interface is that
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