Westermo MA-21 - Manual (Page 2)

8 6021-2002
Switch settings
The MA-21 can through different switch settings be adapted to a vareity of running
conditions. To set the switches, open the plastic case by placing and turning a screw-
driver between top and bottom at the rear of the case.
DANGER! DO NOT OPEN CONNECTED UNIT
1 2 3 4 5
V.24/RS-232-C
CONNECTION LINE
CONNECTION
MAINS
Specifications
Transmission Asynchronous, full/half duplex or simplex
Interface 1 EIA RS-232-C/CCITT V.24
25-position D-sub female, DCE
Interface 2 20 mA current loop, selectable active or passive
Data rate Up to 19.2 bit/s
Indicators Power, RD, TD
Isolation Galvanic isolation with opto-coupler (data transmission)
and transformer (supply)
Isolation voltage 1500V
Overvoltage protection Mains: Breakdown voltage 440V at 230V AC
and 220V at 115V AC
Interface 2: Breakdown voltage transmitter
and receiver 37V
Surge capacity 0.6 kW for 1ms
Power supply Switchable 115/230V +15/ –10% 48–62Hz
Fuse 100mA fast 5x20 mm
Power consumption Max 5VA at 230V AC
Temperature range 5–50°C, ambient temperature
Humidity 0–95% RH, non-condensing
Dimensions WxHxD 161x53x139 mm
Weight 0.5 kg
Mounting With rubber pads or screws. Screws: remove
the two "keyholes" on the bottom of the case