Cinterion
®
Java Terminal Hardware Interface Description
3.8 GPIO Interface
40
PLS62T-W_HID_v01 2018-06-20
Confidential / Prelimenary
Page 30 of 91
Please refer to the “AT Command Set“ for details on how to configure the GPIO pins using AT
commands.
3.8.1 Serial Interface ASC1
The Java Terminal has four pins at the GPIO connector which can be configured as ASC1 in-
terface signals to provide a 2- or 4-wire serial modem interface ASC1. For electrical character-
istics please refer to Table 21.
The following pins at the GPIO connector can be configured as ASC1 interface signals: RXD1,
TXD1, RTS1 and CTS1 (see also Table 14). The configuration is done by AT command
AT^SCFG - see [1]. It is non-volatile and becomes active after a Java Terminal restart.
Java Terminal are designed for use as a DCE. Based on the conventions for DCE-DTE con-
nections they communicate with the customer application (DTE) using the following signals:
• Port TXD @ application sends data to Java Terminal’s TXD1 signal line
• Port RXD @ application receives data from the Java Terminal’s RXD1 signal line
12-pin connector
1 VCCref Input supply for level adjustment. E.g., connect
+5Vout for 5V IO operation
2GND
3 GPIO17,
TXD1 or
SPI_MISO
Configurable via AT command, GPIO or TXD1
(RS-232) or
SPI_MISO signal
GPIO17 /TXD1 /SPI_MISO
4 GPIO16,
RXD1 or
SPI_MOSI
Configurable via AT command, GPIO, RXD1 (RS-
232) or
SPI_MOSI signal
GPIO16 /RXD1 /SPI_MOSI
5 GPIO19,
CTS1 or
SPI_CS
Configurable via AT command, GPIO, CTS1 (RS-
232) or SPI_CS signal
GPIO19 /CTS1 /SPI_CS
6 GPIO18 or
RTS1
Configurable via AT command, GPIO or RTS1
(RS-232) signal
GPIO18 /RTS1
7 +5Vout External power supply up to 100mA, usable as
VCCref input
8DSR0,
GPIO3 or
SPI_CLK
Configurable via AT command DSR0 /GPIO3 /RTS1
9 I2CDAT I
2
C interface
10 I2CCLK I
2
C interface
11 GPIO20 Configurable via AT command
12 GPIO21 Configurable via AT command
Table 14: GPIO connector pin availability and alternate pin functionalities
PIN Signal Comment PLS62T-W
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