Honeywell CIPer 50 Installation & Commissioning Instructions page 19

CIPer
MID (DEFAULT)
Figure 15: RS485-1 three-position slide switch setting MID
Figure 16: RS485-1 three-position slide switch setting BIAS
Figure 17: RS485-1 three-position slide switch setting END
NOTE
• All terminals are protected (up to 24 VAC) against short-circuiting and incorrect wiring –
except when the 3-position slide switch is set to "END," in which case the terminals of the
RS485-1 bus (24, 25, and 26) have no such protection. Higher voltages may damage the
device.
• According to BACnet standards, a minimum of one and a maximum of two BACnet devices
must have its/their bias resistors switched ON. In the case of the RS485-1 interface of the
CIPer Model 50, setting its slide switch to either "BIAS" or "END" fulfills this requirement.
MODEL 50 CONTROLLER – INSTALLATION AND COMMISSIONING INSTRUCTIONS
TM
47 kOHM
RS485-1 (+)
RS485-1 (-)
47 kOHM
550 OHM
BIAS
RS485-1 (+)
RS485-1 (-)
550 OHM
19
+5V
ISO
25
26
GND-1
+5V
ISO
25
26
GND-1
31-00233-02