NBB-800
User Manual for NRSW version 4.5.0.100
3.4.11. COM/IO Shield
The COM/IO Shield has the following specification:
Feature Specification
Feature 1xRS-232/485
1xdigital input
1xdigital output
RS-232 Signals TX, RX
RS-232 Signal Level High > 5 VDC, low < -5 VDC
RS-232 Bitrate Up to 1 Mbit/s
RS-485 Signals A,B
RS-485 Signal Level Differential output, 1.5 VDC- 3.5 VDC
RS-485 Bitrate Up to 1 Mbit/s
RS-485 Termination 120 Ω configurable by SW
DI Signals +, -
DI Level Low: 0 VDC- 3 VDC, high: 0 VDC- 32 VDC
DO Signals NO, COM
DO Level 0-32 VDC/1A
DIO Isolation 1500 VDC
Connector type 8 pin terminal block header 3.5mm
Table 3.17.: Specification of COMIO Shield
Pin Assignment
Pin Signal
V+ V+
V− V−, RS232 GND
1 RS232 RX (NB800 Input); RS485 A (Half-Duplex)
2 RS232 TX (NB800 Output); RS485 B (Half-Duplex)
3 In- (Digital Input isolated)
4 In+ (Digital Input isolated)
5 Out NO (Digital Output isolated, Relay contact normally open)
6 Out COM (Digital Output isolated, Relais common)
Table 3.18.: Pin Assignments of COMIO Shield
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