CTEK Z1204 Relay Module - Manual (Page 7)

TN0019 – Z1216 I/O and Z1204 Relay Module
Hardware Configuration
TN0019 - 28 March, 2011
7
Z1204/Z1216 Power and Communications
The Z1204U and Z1216U I/O modules receive power and communications over a single USB connection.
The Z1204S and Z1216S RS485 I/O modules require input power in the range of 9 - 24VDC and a two-
wire RS485 communications connection. If the communications cable is using a third wire (ground) to
minimize line noise it should be connected to the power supply ground connection on the module. The
physical connections for both RS485 modules are identical and are shown in Figure 7 below.
Figure 7 - Z1204S/Z1216S Power and Communications
R+ - RS485 TR+
R- - RS485 TR-
- Ground
+V - Input power Source - 9 - 24VDC
Z1204 Max Current - 160ma @12VDC
Z1216 Max Current (excluding driven outputs) - 100ma @ 5VDC