Specifications

Installation
3.8 RS-232 / Current Loop Communication
3.8.1 Overview
The following system blocks are referred to in this overview:
EAU-321 AutroSafe Serial Communication Board
BSL-337 AutroSafe BU-70 Interface
BU-100/BU-101 Parallel Operation Panel
BU-70 Display Unit
BSL-12/2 Current Loop/RS-232 Converter
Interfacing BU70 Display Units and BU100/BU101 Panels, AutroSafe Interactive Fire-Alarm System,
116-P-BSL337/EE, Rev. D, 2007-01-25,
Autronica Fire and Security AS
Page 17
EAU-321
BSL-337
AutroCom
RS-232
20mA Current
Loop
ASSP
RS-232
3.8.2 The Autronica Standard Short Protocol (ASSP)
The BU-panels in the BS-100 system are prepared for 20mA current
loop communication with passive transmitter and passive receiver.
Autronicas internal protocol Autronica Standard Short Protocol
(ASSP) is used as the communication protocol for BU-panels.
3.8.3 Current Loop / RS-232 Converter BSL-12/2
Port 0 on the BSL-337 interface uses the ASSP communication
protocol. To enable communication between AutroSafe and
BU-panels, a current loop/RS-232 converter must be used. The
converter’s current loop must be configured and connected as an
active transmitter and active receiver.
For this purpose, the Current Loop/RS-232 Converter BSL-12/2 is
used. The converter is supplied with 24VDC power from the AutroSafe
system panel. The 24VDC power supplied from the AutroSafe panel
has battery backup.
AutroSafe
24VDC
24VDC
BU-70/
BU-100/101
1-16
BSL-12/2
RS-232
20mA
Current Loop
Active transmitter
Active receiver