MR-2900 Installation Manual
21
Table 5: Maximum Capacitance for Network Baud Rates
RS-232 Network Wiring
RS-232 Network wiring uses three (3) wires between each panel (see
Figure 27). The COM1 of each Unit is connected to the COM2 of the next
Unit. MR-2944 Annunciator Units are connected the same as the Control
Unit. Wiring is polarity sensitive.
MR-D1010R Wiring
Refer to
LT-2048 MR-D1010R Fiber Optic Module Installation Instructions
.
Baud Rate
Maximum Capacitance
Maximum Network Nodes
9600
100 nF
254
4800
220 nF
254
2400
470 nF
254
1200
680 nF
200
Notes:
• Ensure that only one COM 2 is connected to each COM 1. If two or more are connected, the
network segment does not work.
• The wire length limit for RS-232 is 20 feet (6m) in conduit, in the same room. For systems using
modems, this is the maximum distance between the panel and the modem.
Figure 27: RS-232 Network
Wiring
