RS-232 Multidrop Manual Addendum 02179 Rev.
TELEDYNE API RS232 MULTI-DROP ADAPTOR The Teledyne API RS232 Multi-drop Adaptors #01427 (A-series) and #04528 (E-series) provides the user with a simple method of communicating via asynchronous RS232 with multiple Teledyne API instruments using a single host system (computer, modem, DAS or terminal). Overview of Adaptor Features 1. Dual DB 9 pin connectors - connected in parallel for ease in interconnecting with additional adaptors in network.
Using a terminal program, issue the command “v rs232_mode=xx”, where xx is defined below: Model M100 M200 M100A M200A M300 M400 M700 xx 35 35 43 43 43 43 43 The software uses the RTS signal from the SBC40 to control the multi-drop interface hardware. The software turns this signal on (logic high) prior to transmitting data, and turns it off within 1 second after the last character has been fully transmitted.
RS-232 Cable Connections Commonly used DB9 / DB25 cable connections for EIA/TIA-232 and V.24 Asynchronous Interfaces.
Figure 1: Multi-drop adaptor Figure 2- A-series rear panel RS-232 connections 5
Figure 3: Multi-drop network.
Figure 4: E-series rear panel with connections for multi-drop option 7
