Micromod Micro-DCI: 53ML5100A LOADING STATION REV. 1 FIRMWARE - Manual (Page 7)

53ML5100A Manual Loading Station
Supplement to the Instruction Bulletin
Installation Procedures 3
2.0 INSTALLATION PROCEDURES
Reference Micro-DCI Instruction Bulletin 53ML900, Upgrading the 53ML5100 Manual Loading Station, for
instructions on installing the new EPROM on the main board.
Datalink is an interrogator/responder serial interface capable of supporting 32 instruments on a single net-
work. It uses an RS485 physical interface. See the Datalink wiring diagram for this instrument in
Figure 2-1 .
The interface for connecting the 53ML5100 Manual Loading Station to a Datalink network is via the rear
terminal board (TB1), pins 19 through 22 (T+, T-, R+, and R-).
The Datalink interface requires four conductors: a transmit pair (T+, T-) and a receive pair (R+, R-). The
voltage levels of each conductor pair conform to the EIA RS-422/485 standard. In accordance with this
standard, the overall Datalink network distance is limited to 4000 feet when #24 AWG twisted pair wire is
used to interconnect the nodes. Adapters are available to convert RS-422/485 to RS-232 or 20 mA current
loops.